X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Freverse_complexity%2Fspeed_clean.ma;fp=matita%2Fmatita%2Flib%2Freverse_complexity%2Fspeed_clean.ma;h=bfd3d34b150a1e6cdc0a7dce299d1989def3239b;hb=b8e8c61042dd7d4d8bc00971e1ebcd6858064682;hp=0000000000000000000000000000000000000000;hpb=990530d17001326448884ea9bdd0d756af9280d9;p=helm.git

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+include "basics/types.ma".
+include "arithmetics/minimization.ma".
+include "arithmetics/bigops.ma".
+include "arithmetics/sigma_pi.ma".
+include "arithmetics/bounded_quantifiers.ma".
+include "reverse_complexity/big_O.ma".
+include "basics/core_notation/napart_2.ma".
+
+(************************* notation for minimization *****************************)
+notation "μ_{ ident i < n } p" 
+  with precedence 80 for @{min $n 0 (λ${ident i}.$p)}.
+
+notation "μ_{ ident i ≤ n } p" 
+  with precedence 80 for @{min (S $n) 0 (λ${ident i}.$p)}.
+  
+notation "μ_{ ident i ∈ [a,b[ } p"
+  with precedence 80 for @{min ($b-$a) $a (λ${ident i}.$p)}.
+  
+notation "μ_{ ident i ∈ [a,b] } p"
+  with precedence 80 for @{min (S $b-$a) $a (λ${ident i}.$p)}.
+  
+(************************************ MAX *************************************)
+notation "Max_{ ident i < n | p } f"
+  with precedence 80
+for @{'bigop $n max 0 (λ${ident i}. $p) (λ${ident i}. $f)}.
+
+notation "Max_{ ident i < n } f"
+  with precedence 80
+for @{'bigop $n max 0 (λ${ident i}.true) (λ${ident i}. $f)}.
+
+notation "Max_{ ident j ∈ [a,b[ } f"
+  with precedence 80
+for @{'bigop ($b-$a) max 0 (λ${ident j}.((λ${ident j}.true) (${ident j}+$a)))
+  (λ${ident j}.((λ${ident j}.$f)(${ident j}+$a)))}.
+  
+notation "Max_{ ident j ∈ [a,b[ | p } f"
+  with precedence 80
+for @{'bigop ($b-$a) max 0 (λ${ident j}.((λ${ident j}.$p) (${ident j}+$a)))
+  (λ${ident j}.((λ${ident j}.$f)(${ident j}+$a)))}.
+
+lemma Max_assoc: ∀a,b,c. max (max a b) c = max a (max b c).
+#a #b #c normalize cases (true_or_false (leb a b)) #leab >leab normalize
+  [cases (true_or_false (leb b c )) #lebc >lebc normalize
+    [>(le_to_leb_true a c) // @(transitive_le ? b) @leb_true_to_le //
+    |>leab //
+    ]
+  |cases (true_or_false (leb b c )) #lebc >lebc normalize //
+   >leab normalize >(not_le_to_leb_false a c) // @lt_to_not_le 
+   @(transitive_lt ? b) @not_le_to_lt @leb_false_to_not_le //
+  ]
+qed.
+
+lemma Max0 : ∀n. max 0 n = n.
+// qed.
+
+lemma Max0r : ∀n. max n 0 = n.
+#n >commutative_max //
+qed.
+
+definition MaxA ≝ 
+  mk_Aop nat 0 max Max0 Max0r (λa,b,c.sym_eq … (Max_assoc a b c)). 
+
+definition MaxAC ≝ mk_ACop nat 0 MaxA commutative_max.
+
+lemma le_Max: ∀f,p,n,a. a < n → p a = true →
+  f a ≤  Max_{i < n | p i}(f i).
+#f #p #n #a #ltan #pa 
+>(bigop_diff p ? 0 MaxAC f a n) // @(le_maxl … (le_n ?))
+qed.
+
+lemma le_MaxI: ∀f,p,n,m,a. m ≤ a → a < n → p a = true →
+  f a ≤  Max_{i ∈ [m,n[ | p i}(f i).
+#f #p #n #m #a #lema #ltan #pa 
+>(bigop_diff ? ? 0 MaxAC (λi.f (i+m)) (a-m) (n-m)) 
+  [<plus_minus_m_m // @(le_maxl … (le_n ?))
+  |<plus_minus_m_m //
+  |/2 by monotonic_lt_minus_l/
+  ]
+qed.
+
+lemma Max_le: ∀f,p,n,b. 
+  (∀a.a < n → p a = true → f a ≤ b) → Max_{i < n | p i}(f i) ≤ b.
+#f #p #n elim n #b #H // 
+#b0 #H1 cases (true_or_false (p b)) #Hb
+  [>bigop_Strue [2:@Hb] @to_max [@H1 // | @H #a #ltab #pa @H1 // @le_S //]
+  |>bigop_Sfalse [2:@Hb] @H #a #ltab #pa @H1 // @le_S //
+  ]
+qed.
+
+(********************************** pairing ***********************************)
+axiom pair: nat → nat → nat.
+axiom fst : nat → nat.
+axiom snd : nat → nat.
+
+interpretation "abstract pair" 'pair f g = (pair f g). 
+
+axiom fst_pair: ∀a,b. fst 〈a,b〉 = a.
+axiom snd_pair: ∀a,b. snd 〈a,b〉 = b.
+axiom surj_pair: ∀x. ∃a,b. x = 〈a,b〉. 
+
+axiom le_fst : ∀p. fst p ≤ p.
+axiom le_snd : ∀p. snd p ≤ p.
+axiom le_pair: ∀a,a1,b,b1. a ≤ a1 → b ≤ b1 → 〈a,b〉 ≤ 〈a1,b1〉.
+
+(************************************* U **************************************)
+axiom U: nat → nat →nat → option nat. 
+
+axiom monotonic_U: ∀i,x,n,m,y.n ≤m →
+  U i x n = Some ? y → U i x m = Some ? y.
+  
+lemma unique_U: ∀i,x,n,m,yn,ym.
+  U i x n = Some ? yn → U i x m = Some ? ym → yn = ym.
+#i #x #n #m #yn #ym #Hn #Hm cases (decidable_le n m)
+  [#lenm lapply (monotonic_U … lenm Hn) >Hm #HS destruct (HS) //
+  |#ltmn lapply (monotonic_U … n … Hm) [@lt_to_le @not_le_to_lt //]
+   >Hn #HS destruct (HS) //
+  ]
+qed.
+
+definition code_for ≝ λf,i.∀x.
+  ∃n.∀m. n ≤ m → U i x m = f x.
+
+definition terminate ≝ λi,x,r. ∃y. U i x r = Some ? y. 
+
+notation "{i ⊙ x} ↓ r" with precedence 60 for @{terminate $i $x $r}. 
+
+lemma terminate_dec: ∀i,x,n. {i ⊙ x} ↓ n ∨ ¬ {i ⊙ x} ↓ n.
+#i #x #n normalize cases (U i x n)
+  [%2 % * #y #H destruct|#y %1 %{y} //]
+qed.
+  
+lemma monotonic_terminate: ∀i,x,n,m.
+  n ≤ m → {i ⊙ x} ↓ n → {i ⊙ x} ↓ m.
+#i #x #n #m #lenm * #z #H %{z} @(monotonic_U … H) //
+qed.
+
+definition termb ≝ λi,x,t. 
+  match U i x t with [None ⇒ false |Some y ⇒ true].
+
+lemma termb_true_to_term: ∀i,x,t. termb i x t = true → {i ⊙ x} ↓ t.
+#i #x #t normalize cases (U i x t) normalize [#H destruct | #y #_ %{y} //]
+qed.    
+
+lemma term_to_termb_true: ∀i,x,t. {i ⊙ x} ↓ t → termb i x t = true.
+#i #x #t * #y #H normalize >H // 
+qed.    
+
+definition out ≝ λi,x,r. 
+  match U i x r with [ None ⇒ 0 | Some z ⇒ z]. 
+
+definition bool_to_nat: bool → nat ≝ 
+  λb. match b with [true ⇒ 1 | false ⇒ 0]. 
+
+coercion bool_to_nat. 
+
+definition pU : nat → nat → nat → nat ≝ λi,x,r.〈termb i x r,out i x r〉.
+
+lemma pU_vs_U_Some : ∀i,x,r,y. pU i x r = 〈1,y〉 ↔ U i x r = Some ? y.
+#i #x #r #y % normalize
+  [cases (U i x r) normalize 
+    [#H cut (0=1) [lapply (eq_f … fst … H) >fst_pair >fst_pair #H @H] 
+     #H1 destruct
+    |#a #H cut (a=y) [lapply (eq_f … snd … H) >snd_pair >snd_pair #H1 @H1] 
+     #H1 //
+    ]
+  |#H >H //]
+qed.
+  
+lemma pU_vs_U_None : ∀i,x,r. pU i x r = 〈0,0〉 ↔ U i x r = None ?.
+#i #x #r % normalize
+  [cases (U i x r) normalize //
+   #a #H cut (1=0) [lapply (eq_f … fst … H) >fst_pair >fst_pair #H1 @H1] 
+   #H1 destruct
+  |#H >H //]
+qed.
+
+lemma fst_pU: ∀i,x,r. fst (pU i x r) = termb i x r.
+#i #x #r normalize cases (U i x r) normalize >fst_pair //
+qed.
+
+lemma snd_pU: ∀i,x,r. snd (pU i x r) = out i x r.
+#i #x #r normalize cases (U i x r) normalize >snd_pair //
+qed.
+
+(********************************* the speedup ********************************)
+
+definition min_input ≝ λh,i,x. μ_{y ∈ [S i,x] } (termb i y (h (S i) y)).
+
+lemma min_input_def : ∀h,i,x. 
+  min_input h i x = min (x -i) (S i) (λy.termb i y (h (S i) y)).
+// qed.
+
+lemma min_input_i: ∀h,i,x. x ≤ i → min_input h i x = S i.
+#h #i #x #lexi >min_input_def 
+cut (x - i = 0) [@sym_eq /2 by eq_minus_O/] #Hcut //
+qed. 
+
+lemma min_input_to_terminate: ∀h,i,x. 
+  min_input h i x = x → {i ⊙ x} ↓ (h (S i) x).
+#h #i #x #Hminx
+cases (decidable_le (S i) x) #Hix
+  [cases (true_or_false (termb i x (h (S i) x))) #Hcase
+    [@termb_true_to_term //
+    |<Hminx in Hcase; #H lapply (fmin_false (λx.termb i x (h (S i) x)) (x-i) (S i) H)
+     >min_input_def in Hminx; #Hminx >Hminx in ⊢ (%→?); 
+     <plus_n_Sm <plus_minus_m_m [2: @lt_to_le //]
+     #Habs @False_ind /2/
+    ]
+  |@False_ind >min_input_i in Hminx; 
+    [#eqix >eqix in Hix; * /2/ | @le_S_S_to_le @not_le_to_lt //]
+  ]
+qed.
+
+lemma min_input_to_lt: ∀h,i,x. 
+  min_input h i x = x → i < x.
+#h #i #x #Hminx cases (decidable_le (S i) x) // 
+#ltxi @False_ind >min_input_i in Hminx; 
+  [#eqix >eqix in ltxi; * /2/ | @le_S_S_to_le @not_le_to_lt //]
+qed.
+
+lemma le_to_min_input: ∀h,i,x,x1. x ≤ x1 →
+  min_input h i x = x → min_input h i x1 = x.
+#h #i #x #x1 #lex #Hminx @(min_exists … (le_S_S … lex)) 
+  [@(fmin_true … (sym_eq … Hminx)) //
+  |@(min_input_to_lt … Hminx)
+  |#j #H1 <Hminx @lt_min_to_false //
+  |@plus_minus_m_m @le_S_S @(transitive_le … lex) @lt_to_le 
+   @(min_input_to_lt … Hminx)
+  ]
+qed.
+  
+definition g ≝ λh,u,x. 
+  S (max_{i ∈[u,x[ | eqb (min_input h i x) x} (out i x (h (S i) x))).
+  
+lemma g_def : ∀h,u,x. g h u x =
+  S (max_{i ∈[u,x[ | eqb (min_input h i x) x} (out i x (h (S i) x))).
+// qed.
+
+lemma le_u_to_g_1 : ∀h,u,x. x ≤ u → g h u x = 1.
+#h #u #x #lexu >g_def cut (x-u = 0) [/2 by minus_le_minus_minus_comm/]
+#eq0 >eq0 normalize // qed.
+
+lemma g_lt : ∀h,i,x. min_input h i x = x →
+  out i x (h (S i) x) < g h 0 x.
+#h #i #x #H @le_S_S @(le_MaxI … i) /2 by min_input_to_lt/  
+qed.
+
+(*
+axiom ax1: ∀h,i.
+   (∃y.i < y ∧ (termb i y (h (S i) y)=true)) ∨ 
+    ∀y. i < y → (termb i y (h (S i) y)=false).
+
+lemma eventually_0: ∀h,u.∃nu.∀x. nu < x → 
+  max_{i ∈ [0,u[ | eqb (min_input h i x) x} (out i x (h (S i) x)) = 0.
+#h #u elim u
+  [%{0} normalize //
+  |#u0 * #nu0 #Hind cases (ax1 h u0) 
+    [* #x0 * #leu0x0 #Hx0 %{(max nu0 x0)}
+     #x #Hx >bigop_Sfalse
+      [>(minus_n_O u0) @Hind @(le_to_lt_to_lt … Hx) /2 by le_maxl/
+      |@not_eq_to_eqb_false % #Hf @(absurd (x ≤ x0)) 
+        [<Hf @true_to_le_min //
+        |@lt_to_not_le @(le_to_lt_to_lt … Hx) /2 by le_maxl/
+        ]
+      ]
+    |#H %{(max u0 nu0)} #x #Hx >bigop_Sfalse
+      [>(minus_n_O u0) @Hind @(le_to_lt_to_lt … Hx) @le_maxr //
+      |@not_eq_to_eqb_false >min_input_def
+       >(min_not_exists (λy.(termb (u0+0) y (h (S (u0+0)) y)))) 
+        [<plus_n_O <plus_n_Sm <plus_minus_m_m 
+          [% #H1 /2/ 
+          |@lt_to_le @(le_to_lt_to_lt … Hx) @le_maxl //
+          ]
+        |/2 by /
+        ]
+      ]
+    ]
+  ]
+qed.
+
+definition almost_equal ≝ λf,g:nat → nat. ∃nu.∀x. nu < x → f x = g x.
+
+definition almost_equal1 ≝ λf,g:nat → nat. ¬ ∀nu.∃x. nu < x ∧ f x ≠ g x.
+
+interpretation "almost equal" 'napart f g = (almost_equal f g). 
+
+lemma condition_1: ∀h,u.g h 0 ≈ g h u.
+#h #u cases (eventually_0 h u) #nu #H %{(max u nu)} #x #Hx @(eq_f ?? S)
+>(bigop_sumI 0 u x (λi:ℕ.eqb (min_input h i x) x) nat  0 MaxA)
+  [>H // @(le_to_lt_to_lt …Hx) /2 by le_maxl/
+  |@lt_to_le @(le_to_lt_to_lt …Hx) /2 by le_maxr/
+  |//
+  ]
+qed. *)
+
+lemma max_neq0 : ∀a,b. max a b ≠ 0 → a ≠ 0 ∨ b ≠ 0.
+#a #b whd in match (max a b); cases (true_or_false (leb a b)) #Hcase >Hcase
+  [#H %2 @H | #H %1 @H]  
+qed.
+
+definition almost_equal ≝ λf,g:nat → nat. ¬ ∀nu.∃x. nu < x ∧ f x ≠ g x.
+interpretation "almost equal" 'napart f g = (almost_equal f g). 
+
+lemma eventually_cancelled: ∀h,u.¬∀nu.∃x. nu < x ∧
+  max_{i ∈ [0,u[ | eqb (min_input h i x) x} (out i x (h (S i) x)) ≠ 0.
+#h #u elim u
+  [normalize % #H cases (H u) #x * #_ * #H1 @H1 //
+  |#u0 @not_to_not #Hind #nu cases (Hind nu) #x * #ltx
+   cases (true_or_false (eqb (min_input h (u0+O) x) x)) #Hcase 
+    [>bigop_Strue [2:@Hcase] #Hmax cases (max_neq0 … Hmax) -Hmax
+      [2: #H %{x} % // <minus_n_O @H]
+     #Hneq0 (* if x is not enough we retry with nu=x *)
+     cases (Hind x) #x1 * #ltx1 
+     >bigop_Sfalse 
+      [#H %{x1} % [@transitive_lt //| <minus_n_O @H]
+      |@not_eq_to_eqb_false >(le_to_min_input … (eqb_true_to_eq … Hcase))
+        [@lt_to_not_eq @ltx1 | @lt_to_le @ltx1]
+      ]  
+    |>bigop_Sfalse [2:@Hcase] #H %{x} % // <minus_n_O @H
+    ]
+  ]
+qed.
+
+lemma condition_1: ∀h,u.g h 0 ≈ g h u.
+#h #u @(not_to_not … (eventually_cancelled h u))
+#H #nu cases (H (max u nu)) #x * #ltx #Hdiff 
+%{x} % [@(le_to_lt_to_lt … ltx) @(le_maxr … (le_n …))] @(not_to_not … Hdiff) 
+#H @(eq_f ?? S) >(bigop_sumI 0 u x (λi:ℕ.eqb (min_input h i x) x) nat  0 MaxA) 
+  [>H // |@lt_to_le @(le_to_lt_to_lt …ltx) /2 by le_maxr/ |//]
+qed.
+
+(******************************** Condition 2 *********************************)
+definition total ≝ λf.λx:nat. Some nat (f x).
+  
+lemma exists_to_exists_min: ∀h,i. (∃x. i < x ∧ {i ⊙ x} ↓ h (S i) x) → ∃y. min_input h i y = y.
+#h #i * #x * #ltix #Hx %{(min_input h i x)} @min_spec_to_min @found //
+  [@(f_min_true (λy:ℕ.termb i y (h (S i) y))) %{x} % [% // | @term_to_termb_true //]
+  |#y #leiy #lty @(lt_min_to_false ????? lty) //
+  ]
+qed.
+
+lemma condition_2: ∀h,i. code_for (total (g h 0)) i → ¬∃x. i<x ∧ {i ⊙ x} ↓ h (S i) x.
+#h #i whd in ⊢(%→?); #H % #H1 cases (exists_to_exists_min … H1) #y #Hminy
+lapply (g_lt … Hminy)
+lapply (min_input_to_terminate … Hminy) * #r #termy
+cases (H y) -H #ny #Hy 
+cut (r = g h 0 y) [@(unique_U … ny … termy) @Hy //] #Hr
+whd in match (out ???); >termy >Hr  
+#H @(absurd ? H) @le_to_not_lt @le_n
+qed.
+
+
+(********************** complexity ***********************)
+
+(* We assume operations have a minimal structural complexity MSC. 
+For instance, for time complexity, MSC is equal to the size of input.
+For space complexity, MSC is typically 0, since we only measure the
+space required in addition to dimension of the input. *)
+
+axiom MSC : nat → nat.
+axiom MSC_le: ∀n. MSC n ≤ n.
+axiom monotonic_MSC: monotonic ? le MSC.
+axiom MSC_pair: ∀a,b. MSC 〈a,b〉 ≤ MSC a + MSC b.
+
+(* C s i means i is running in O(s) *)
+ 
+definition C ≝ λs,i.∃c.∃a.∀x.a ≤ x → ∃y. 
+  U i x (c*(s x)) = Some ? y.
+
+(* C f s means f ∈ O(s) where MSC ∈O(s) *)
+definition CF ≝ λs,f.O s MSC ∧ ∃i.code_for (total f) i ∧ C s i.
+ 
+lemma ext_CF : ∀f,g,s. (∀n. f n = g n) → CF s f → CF s g.
+#f #g #s #Hext * #HO  * #i * #Hcode #HC % // %{i} %
+  [#x cases (Hcode x) #a #H %{a} whd in match (total ??); <Hext @H | //] 
+qed.
+
+(* lemma ext_CF_total : ∀f,g,s. (∀n. f n = g n) → CF s (total f) → CF s (total g).
+#f #g #s #Hext * #HO * #i * #Hcode #HC % // %{i} % [2:@HC]
+#x cases (Hcode x) #a #H %{a} #m #leam >(H m leam) normalize @eq_f @Hext
+qed. *)
+
+lemma monotonic_CF: ∀s1,s2,f.(∀x. s1 x ≤  s2 x) → CF s1 f → CF s2 f.
+#s1 #s2 #f #H * #HO * #i * #Hcode #Hs1 % 
+  [cases HO #c * #a -HO #HO %{c} %{a} #n #lean @(transitive_le … (HO n lean))
+   @le_times // 
+  |%{i} % [//] cases Hs1 #c * #a -Hs1 #Hs1 %{c} %{a} #n #lean 
+   cases(Hs1 n lean) #y #Hy %{y} @(monotonic_U …Hy) @le_times // 
+  ]
+qed.
+
+lemma O_to_CF: ∀s1,s2,f.O s2 s1 → CF s1 f → CF s2 f.
+#s1 #s2 #f #H * #HO * #i * #Hcode #Hs1 % 
+  [@(O_trans … H) //
+  |%{i} % [//] cases Hs1 #c * #a -Hs1 #Hs1 
+   cases H #c1 * #a1 #Ha1 %{(c*c1)} %{(a+a1)} #n #lean 
+   cases(Hs1 n ?) [2:@(transitive_le … lean) //] #y #Hy %{y} @(monotonic_U …Hy)
+   >associative_times @le_times // @Ha1 @(transitive_le … lean) //
+  ]
+qed.
+
+lemma timesc_CF: ∀s,f,c.CF (λx.c*s x) f → CF s f.
+#s #f #c @O_to_CF @O_times_c 
+qed.
+
+(********************************* composition ********************************)
+axiom CF_comp: ∀f,g,sf,sg,sh. CF sg g → CF sf f → 
+  O sh (λx. sg x + sf (g x)) → CF sh (f ∘ g).
+  
+lemma CF_comp_ext: ∀f,g,h,sh,sf,sg. CF sg g → CF sf f → 
+  (∀x.f(g x) = h x) → O sh (λx. sg x + sf (g x)) → CF sh h.
+#f #g #h #sh #sf #sg #Hg #Hf #Heq #H @(ext_CF (f ∘ g))
+  [#n normalize @Heq | @(CF_comp … H) //]
+qed.
+
+(*
+lemma CF_comp1: ∀f,g,s. CF s (total g) → CF s (total f) → 
+  CF s (total (f ∘ g)).
+#f #g #s #Hg #Hf @(timesc_CF … 2) @(monotonic_CF … (CF_comp … Hg Hf))
+*)
+
+(*
+axiom CF_comp_ext2: ∀f,g,h,sf,sh. CF sh (total g) → CF sf (total f) → 
+  (∀x.f(g x) = h x) → 
+  (∀x. sf (g x) ≤ sh x) → CF sh (total h). 
+
+lemma main_MSC: ∀h,f. CF h f → O h (λx.MSC (f x)). 
+ 
+axiom CF_S: CF MSC S.
+axiom CF_fst: CF MSC fst.
+axiom CF_snd: CF MSC snd.
+
+lemma CF_compS: ∀h,f. CF h f → CF h (S ∘ f).
+#h #f #Hf @(CF_comp … Hf CF_S) @O_plus // @main_MSC //
+qed. 
+
+lemma CF_comp_fst: ∀h,f. CF h (total f) → CF h (total (fst ∘ f)).
+#h #f #Hf @(CF_comp … Hf CF_fst) @O_plus // @main_MSC //
+qed.
+
+lemma CF_comp_snd: ∀h,f. CF h (total f) → CF h (total (snd ∘ f)).
+#h #f #Hf @(CF_comp … Hf CF_snd) @O_plus // @main_MSC //
+qed. *)
+
+definition id ≝ λx:nat.x.
+
+axiom CF_id: CF MSC id.
+axiom CF_compS: ∀h,f. CF h f → CF h (S ∘ f).
+axiom CF_comp_fst: ∀h,f. CF h f → CF h (fst ∘ f).
+axiom CF_comp_snd: ∀h,f. CF h f → CF h (snd ∘ f). 
+axiom CF_comp_pair: ∀h,f,g. CF h f → CF h g → CF h (λx. 〈f x,g x〉). 
+
+lemma CF_fst: CF MSC fst.
+@(ext_CF (fst ∘ id)) [#n //] @(CF_comp_fst … CF_id)
+qed.
+
+lemma CF_snd: CF MSC snd.
+@(ext_CF (snd ∘ id)) [#n //] @(CF_comp_snd … CF_id)
+qed.
+
+(************************************** eqb ***********************************)
+(* definition btotal ≝ 
+  λf.λx:nat. match f x with [true ⇒ Some ? 0 |false ⇒ Some ? 1]. *)
+  
+axiom CF_eqb: ∀h,f,g.
+  CF h f → CF h g → CF h (λx.eqb (f x) (g x)).
+
+(* 
+axiom eqb_compl2: ∀h,f,g.
+  CF2 h (total2 f) → CF2 h (total2 g) → 
+    CF2 h (btotal2 (λx1,x2.eqb (f x1 x2) (g x1 x2))).
+
+axiom eqb_min_input_compl:∀h,x. 
+   CF (λi.∑_{y ∈ [S i,S x[ }(h i y))
+   (btotal (λi.eqb (min_input h i x) x)). *)
+(*********************************** maximum **********************************) 
+
+axiom CF_max: ∀a,b.∀p:nat →bool.∀f,ha,hb,hp,hf,s.
+  CF ha a → CF hb b → CF hp p → CF hf f → 
+  O s (λx.ha x + hb x + ∑_{i ∈[a x ,b x[ }(hp 〈i,x〉 + hf 〈i,x〉)) →
+  CF s (λx.max_{i ∈[a x,b x[ | p 〈i,x〉 }(f 〈i,x〉)). 
+
+(******************************** minimization ********************************) 
+
+axiom CF_mu: ∀a,b.∀f:nat →bool.∀sa,sb,sf,s.
+  CF sa a → CF sb b → CF sf f → 
+  O s (λx.sa x + sb x + ∑_{i ∈[a x ,S(b x)[ }(sf 〈i,x〉)) →
+  CF s (λx.μ_{i ∈[a x,b x] }(f 〈i,x〉)).
+
+(****************************** constructibility ******************************)
+ 
+definition constructible ≝ λs. CF s s.
+
+lemma constr_comp : ∀s1,s2. constructible s1 → constructible s2 →
+  (∀x. x ≤ s2 x) → constructible (s2 ∘ s1).
+#s1 #s2 #Hs1 #Hs2 #Hle @(CF_comp … Hs1 Hs2) @O_plus @le_to_O #x [@Hle | //] 
+qed.
+
+lemma ext_constr: ∀s1,s2. (∀x.s1 x = s2 x) → 
+  constructible s1 → constructible s2.
+#s1 #s2 #Hext #Hs1 @(ext_CF … Hext) @(monotonic_CF … Hs1)  #x >Hext //
+qed. 
+
+(********************************* simulation *********************************)
+
+axiom sU : nat → nat. 
+
+axiom monotonic_sU: ∀i1,i2,x1,x2,s1,s2. i1 ≤ i2 → x1 ≤ x2 → s1 ≤ s2 →
+  sU 〈i1,〈x1,s1〉〉 ≤ sU 〈i2,〈x2,s2〉〉.
+
+lemma monotonic_sU_aux : ∀x1,x2. fst x1 ≤ fst x2 → fst (snd x1) ≤ fst (snd x2) →
+snd (snd x1) ≤ snd (snd x2) → sU x1 ≤ sU x2.
+#x1 #x2 cases (surj_pair x1) #a1 * #y #eqx1 >eqx1 -eqx1 cases (surj_pair y) 
+#b1 * #c1 #eqy >eqy -eqy
+cases (surj_pair x2) #a2 * #y2 #eqx2 >eqx2 -eqx2 cases (surj_pair y2) 
+#b2 * #c2 #eqy2 >eqy2 -eqy2 >fst_pair >snd_pair >fst_pair >snd_pair 
+>fst_pair >snd_pair >fst_pair >snd_pair @monotonic_sU
+qed.
+  
+axiom sU_le: ∀i,x,s. s ≤ sU 〈i,〈x,s〉〉.
+axiom sU_le_i: ∀i,x,s. MSC i ≤ sU 〈i,〈x,s〉〉.
+axiom sU_le_x: ∀i,x,s. MSC x ≤ sU 〈i,〈x,s〉〉.
+
+definition pU_unary ≝ λp. pU (fst p) (fst (snd p)) (snd (snd p)).
+
+axiom CF_U : CF sU pU_unary.
+
+definition termb_unary ≝ λx:ℕ.termb (fst x) (fst (snd x)) (snd (snd x)).
+definition out_unary ≝ λx:ℕ.out (fst x) (fst (snd x)) (snd (snd x)).
+
+lemma CF_termb: CF sU termb_unary. 
+@(ext_CF (fst ∘ pU_unary)) [2: @CF_comp_fst @CF_U]
+#n whd in ⊢ (??%?); whd in  ⊢ (??(?%)?); >fst_pair % 
+qed.
+
+lemma CF_out: CF sU out_unary. 
+@(ext_CF (snd ∘ pU_unary)) [2: @CF_comp_snd @CF_U]
+#n whd in ⊢ (??%?); whd in  ⊢ (??(?%)?); >snd_pair % 
+qed.
+
+(*
+lemma CF_termb_comp: ∀f.CF (sU ∘ f) (termb_unary ∘ f).
+#f @(CF_comp … CF_termb) *)
+  
+(******************** complexity of g ********************)
+
+definition unary_g ≝ λh.λux. g h (fst ux) (snd ux).
+definition auxg ≝ 
+  λh,ux. max_{i ∈[fst ux,snd ux[ | eqb (min_input h i (snd ux)) (snd ux)} 
+    (out i (snd ux) (h (S i) (snd ux))).
+
+lemma compl_g1 : ∀h,s. CF s (auxg h) → CF s (unary_g h).
+#h #s #H1 @(CF_compS ? (auxg h) H1) 
+qed.
+
+definition aux1g ≝ 
+  λh,ux. max_{i ∈[fst ux,snd ux[ | (λp. eqb (min_input h (fst p) (snd (snd p))) (snd (snd p))) 〈i,ux〉} 
+    ((λp.out (fst p) (snd (snd p)) (h (S (fst p)) (snd (snd p)))) 〈i,ux〉).
+
+lemma eq_aux : ∀h,x.aux1g h x = auxg h x.
+#h #x @same_bigop
+  [#n #_ >fst_pair >snd_pair // |#n #_ #_ >fst_pair >snd_pair //]
+qed.
+
+lemma compl_g2 : ∀h,s1,s2,s. 
+  CF s1
+    (λp:ℕ.eqb (min_input h (fst p) (snd (snd p))) (snd (snd p))) →
+  CF s2
+    (λp:ℕ.out (fst p) (snd (snd p)) (h (S (fst p)) (snd (snd p)))) →
+  O s (λx.MSC x + ∑_{i ∈[fst x ,snd x[ }(s1 〈i,x〉+s2 〈i,x〉)) → 
+  CF s (auxg h).
+#h #s1 #s2 #s #Hs1 #Hs2 #HO @(ext_CF (aux1g h)) 
+  [#n whd in ⊢ (??%%); @eq_aux]
+@(CF_max … CF_fst CF_snd Hs1 Hs2 …) @(O_trans … HO) 
+@O_plus [@O_plus @O_plus_l // | @O_plus_r //]
+qed.  
+
+lemma compl_g3 : ∀h,s.
+  CF s (λp:ℕ.min_input h (fst p) (snd (snd p))) →
+  CF s (λp:ℕ.eqb (min_input h (fst p) (snd (snd p))) (snd (snd p))).
+#h #s #H @(CF_eqb … H) @(CF_comp … CF_snd CF_snd) @(O_trans … (proj1 … H))
+@O_plus // %{1} %{0} #n #_ >commutative_times <times_n_1 @monotonic_MSC //
+qed.
+
+definition min_input_aux ≝ λh,p.
+  μ_{y ∈ [S (fst p),snd (snd p)] } 
+    ((λx.termb (fst (snd x)) (fst x) (h (S (fst (snd x))) (fst x))) 〈y,p〉). 
+    
+lemma min_input_eq : ∀h,p. 
+    min_input_aux h p  =
+    min_input h (fst p) (snd (snd p)).
+#h #p >min_input_def whd in ⊢ (??%?); >minus_S_S @min_f_g #i #_ #_ 
+whd in ⊢ (??%%); >fst_pair >snd_pair //
+qed.
+
+definition termb_aux ≝ λh.
+  termb_unary ∘ λp.〈fst (snd p),〈fst p,h (S (fst (snd p))) (fst p)〉〉.
+
+(*
+lemma termb_aux : ∀h,p.
+  (λx:ℕ.termb (fst x) (fst (snd x)) (snd (snd x))) 
+    〈fst (snd p),〈fst p,h (S (fst (snd p))) (fst p)〉〉 =
+  termb (fst (snd p)) (fst p) (h (S (fst (snd p))) (fst p)) .
+#h #p normalize >fst_pair >snd_pair >fst_pair >snd_pair // 
+qed. *)
+
+lemma compl_g4 : ∀h,s1,s.
+  (CF s1 
+    (λp.termb (fst (snd p)) (fst p) (h (S (fst (snd p))) (fst p)))) →
+   (O s (λx.MSC x + ∑_{i ∈[S(fst x) ,S(snd (snd x))[ }(s1 〈i,x〉))) →
+  CF s (λp:ℕ.min_input h (fst p) (snd (snd p))).
+#h #s1 #s #Hs1 #HO @(ext_CF (min_input_aux h))
+ [#n whd in ⊢ (??%%); @min_input_eq]
+@(CF_mu … MSC MSC … Hs1) 
+  [@CF_compS @CF_fst 
+  |@CF_comp_snd @CF_snd
+  |@(O_trans … HO) @O_plus [@O_plus @O_plus_l // | @O_plus_r //]
+(* @(ext_CF (btotal (termb_aux h)))
+  [#n normalize >fst_pair >snd_pair >fst_pair >snd_pair // ]
+@(CF_compb … CF_termb) *)
+qed.
+
+(************************* a couple of technical lemmas ***********************)
+lemma minus_to_0: ∀a,b. a ≤ b → minus a b = 0.
+#a elim a // #n #Hind * 
+  [#H @False_ind /2 by absurd/ | #b normalize #H @Hind @le_S_S_to_le /2/]
+qed.
+
+lemma sigma_bound:  ∀h,a,b. monotonic nat le h → 
+  ∑_{i ∈ [a,S b[ }(h i) ≤  (S b-a)*h b.
+#h #a #b #H cases (decidable_le a b) 
+  [#leab cut (b = pred (S b - a + a)) 
+    [<plus_minus_m_m // @le_S //] #Hb >Hb in match (h b);
+   generalize in match (S b -a);
+   #n elim n 
+    [//
+    |#m #Hind >bigop_Strue [2://] @le_plus 
+      [@H @le_n |@(transitive_le … Hind) @le_times [//] @H //]
+    ]
+  |#ltba lapply (not_le_to_lt … ltba) -ltba #ltba
+   cut (S b -a = 0) [@minus_to_0 //] #Hcut >Hcut //
+  ]
+qed.
+
+lemma sigma_bound_decr:  ∀h,a,b. (∀a1,a2. a1 ≤ a2 → a2 < b → h a2 ≤ h a1) → 
+  ∑_{i ∈ [a,b[ }(h i) ≤  (b-a)*h a.
+#h #a #b #H cases (decidable_le a b) 
+  [#leab cut ((b -a) +a ≤ b) [/2 by le_minus_to_plus_r/] generalize in match (b -a);
+   #n elim n 
+    [//
+    |#m #Hind >bigop_Strue [2://] #Hm 
+     cut (m+a ≤ b) [@(transitive_le … Hm) //] #Hm1
+     @le_plus [@H // |@(transitive_le … (Hind Hm1)) //]
+    ]
+  |#ltba lapply (not_le_to_lt … ltba) -ltba #ltba
+   cut (b -a = 0) [@minus_to_0 @lt_to_le @ltba] #Hcut >Hcut //
+  ]
+qed. 
+
+lemma coroll: ∀s1:nat→nat. (∀n. monotonic ℕ le (λa:ℕ.s1 〈a,n〉)) → 
+O (λx.(snd (snd x)-fst x)*(s1 〈snd (snd x),x〉)) 
+  (λx.∑_{i ∈[S(fst x) ,S(snd (snd x))[ }(s1 〈i,x〉)).
+#s1 #Hs1 %{1} %{0} #n #_ >commutative_times <times_n_1 
+@(transitive_le … (sigma_bound …)) [@Hs1|>minus_S_S //]
+qed.
+
+lemma coroll2: ∀s1:nat→nat. (∀n,a,b. a ≤ b → b < snd n → s1 〈b,n〉 ≤ s1 〈a,n〉) → 
+O (λx.(snd x - fst x)*s1 〈fst x,x〉) (λx.∑_{i ∈[fst x,snd x[ }(s1 〈i,x〉)).
+#s1 #Hs1 %{1} %{0} #n #_ >commutative_times <times_n_1 
+@(transitive_le … (sigma_bound_decr …)) [2://] @Hs1 
+qed.
+
+lemma compl_g5 : ∀h,s1.(∀n. monotonic ℕ le (λa:ℕ.s1 〈a,n〉)) →
+  (CF s1 
+    (λp.termb (fst (snd p)) (fst p) (h (S (fst (snd p))) (fst p)))) →
+  CF (λx.MSC x + (snd (snd x)-fst x)*s1 〈snd (snd x),x〉) 
+    (λp:ℕ.min_input h (fst p) (snd (snd p))).
+#h #s1 #Hmono #Hs1 @(compl_g4 … Hs1) @O_plus 
+[@O_plus_l // |@O_plus_r @coroll @Hmono]
+qed.
+
+(*
+axiom compl_g6: ∀h.
+  (* constructible (λx. h (fst x) (snd x)) → *)
+  (CF (λx. max (MSC x) (sU 〈fst (snd x),〈fst x,h (S (fst (snd x))) (fst x)〉〉))
+    (λp.termb (fst (snd p)) (fst p) (h (S (fst (snd p))) (fst p)))).
+*)
+
+lemma compl_g6: ∀h.
+  constructible (λx. h (fst x) (snd x)) →
+  (CF (λx. sU 〈max (fst (snd x)) (snd (snd x)),〈fst x,h (S (fst (snd x))) (fst x)〉〉) 
+    (λp.termb (fst (snd p)) (fst p) (h (S (fst (snd p))) (fst p)))).
+#h #hconstr @(ext_CF (termb_aux h))
+  [#n normalize >fst_pair >snd_pair >fst_pair >snd_pair // ]
+@(CF_comp … (λx.MSC x + h (S (fst (snd x))) (fst x)) … CF_termb) 
+  [@CF_comp_pair
+    [@CF_comp_fst @(monotonic_CF … CF_snd) #x //
+    |@CF_comp_pair
+      [@(monotonic_CF … CF_fst) #x //
+      |@(ext_CF ((λx.h (fst x) (snd x))∘(λx.〈S (fst (snd x)),fst x〉)))
+        [#n normalize >fst_pair >snd_pair %]
+       @(CF_comp … MSC …hconstr)
+        [@CF_comp_pair [@CF_compS @CF_comp_fst // |//]
+        |@O_plus @le_to_O [//|#n >fst_pair >snd_pair //]
+        ]
+      ]
+    ]
+  |@O_plus
+    [@O_plus
+      [@(O_trans … (λx.MSC (fst x) + MSC (max (fst (snd x)) (snd (snd x))))) 
+        [%{2} %{0} #x #_ cases (surj_pair x) #a * #b #eqx >eqx
+         >fst_pair >snd_pair @(transitive_le … (MSC_pair …)) 
+         >distributive_times_plus @le_plus [//]
+         cases (surj_pair b) #c * #d #eqb >eqb
+         >fst_pair >snd_pair @(transitive_le … (MSC_pair …)) 
+         whd in ⊢ (??%); @le_plus 
+          [@monotonic_MSC @(le_maxl … (le_n …)) 
+          |>commutative_times <times_n_1 @monotonic_MSC @(le_maxr … (le_n …))  
+          ]
+        |@O_plus [@le_to_O #x @sU_le_x |@le_to_O #x @sU_le_i]
+        ]     
+      |@le_to_O #n @sU_le
+      ] 
+    |@le_to_O #x @monotonic_sU // @(le_maxl … (le_n …)) ]
+  ]
+qed.
+             
+(* definition faux1 ≝ λh.
+  (λx.MSC x + (snd (snd x)-fst x)*(λx.sU 〈fst (snd x),〈fst x,h (S (fst (snd x))) (fst x)〉〉) 〈snd (snd x),x〉).
+  
+(* complexity of min_input *)
+lemma compl_g7: ∀h. 
+  (∀x.MSC x≤h (S (fst (snd x))) (fst x)) →
+  constructible (λx. h (fst x) (snd x)) →
+  (∀n. monotonic ? le (h n)) → 
+  CF (λx.MSC x + (snd (snd x)-fst x)*sU 〈fst x,〈snd (snd x),h (S (fst x)) (snd (snd x))〉〉)
+    (λp:ℕ.min_input h (fst p) (snd (snd p))).
+#h #hle #hcostr #hmono @(monotonic_CF … (faux1 h))
+  [#n normalize >fst_pair >snd_pair //]
+@compl_g5 [2:@(compl_g6 h hcostr)] #n #x #y #lexy >fst_pair >snd_pair 
+>fst_pair >snd_pair @monotonic_sU // @hmono @lexy
+qed.*)
+
+definition big : nat →nat ≝ λx. 
+  let m ≝ max (fst x) (snd x) in 〈m,m〉.
+
+lemma big_def : ∀a,b. big 〈a,b〉 = 〈max a b,max a b〉.
+#a #b normalize >fst_pair >snd_pair // qed.
+
+lemma le_big : ∀x. x ≤ big x. 
+#x cases (surj_pair x) #a * #b #eqx >eqx @le_pair >fst_pair >snd_pair 
+[@(le_maxl … (le_n …)) | @(le_maxr … (le_n …))]
+qed.
+
+definition faux2 ≝ λh.
+  (λx.MSC x + (snd (snd x)-fst x)*
+    (λx.sU 〈max (fst(snd x)) (snd(snd x)),〈fst x,h (S (fst (snd x))) (fst x)〉〉) 〈snd (snd x),x〉).
+ 
+(* proviamo con x *)
+lemma compl_g7: ∀h. 
+  constructible (λx. h (fst x) (snd x)) →
+  (∀n. monotonic ? le (h n)) → 
+  CF (λx.MSC x + (snd (snd x)-fst x)*sU 〈max (fst x) (snd x),〈snd (snd x),h (S (fst x)) (snd (snd x))〉〉)
+    (λp:ℕ.min_input h (fst p) (snd (snd p))).
+#h #hcostr #hmono @(monotonic_CF … (faux2 h))
+  [#n normalize >fst_pair >snd_pair //]
+@compl_g5 [2:@(compl_g6 h hcostr)] #n #x #y #lexy >fst_pair >snd_pair 
+>fst_pair >snd_pair @monotonic_sU // @hmono @lexy
+qed.
+
+(* proviamo con x *)
+lemma compl_g71: ∀h. 
+  constructible (λx. h (fst x) (snd x)) →
+  (∀n. monotonic ? le (h n)) → 
+  CF (λx.MSC (big x) + (snd (snd x)-fst x)*sU 〈max (fst x) (snd x),〈snd (snd x),h (S (fst x)) (snd (snd x))〉〉)
+    (λp:ℕ.min_input h (fst p) (snd (snd p))).
+#h #hcostr #hmono @(monotonic_CF … (compl_g7 h hcostr hmono)) #x
+@le_plus [@monotonic_MSC //]
+cases (decidable_le (fst x) (snd(snd x))) 
+  [#Hle @le_times // @monotonic_sU  
+  |#Hlt >(minus_to_0 … (lt_to_le … )) [// | @not_le_to_lt @Hlt]
+  ]
+qed.
+
+(*
+axiom compl_g8: ∀h.
+  CF (λx. sU 〈fst x,〈snd (snd x),h (S (fst x)) (snd (snd x))〉〉)
+    (λp:ℕ.out (fst p) (snd (snd p)) (h (S (fst p)) (snd (snd p)))). *)
+
+definition out_aux ≝ λh.
+  out_unary ∘ λp.〈fst p,〈snd(snd p),h (S (fst p)) (snd (snd p))〉〉.
+
+lemma compl_g8: ∀h.
+  constructible (λx. h (fst x) (snd x)) →
+  (CF (λx. sU 〈max (fst x) (snd x),〈snd(snd x),h (S (fst x)) (snd(snd x))〉〉) 
+    (λp.out (fst p) (snd (snd p)) (h (S (fst p)) (snd (snd p))))).
+#h #hconstr @(ext_CF (out_aux h))
+  [#n normalize >fst_pair >snd_pair >fst_pair >snd_pair // ]
+@(CF_comp … (λx.h (S (fst x)) (snd(snd x)) + MSC x) … CF_out) 
+  [@CF_comp_pair
+    [@(monotonic_CF … CF_fst) #x //
+    |@CF_comp_pair
+      [@CF_comp_snd @(monotonic_CF … CF_snd) #x //
+      |@(ext_CF ((λx.h (fst x) (snd x))∘(λx.〈S (fst x),snd(snd x)〉)))
+        [#n normalize >fst_pair >snd_pair %]
+       @(CF_comp … MSC …hconstr)
+        [@CF_comp_pair [@CF_compS // | @CF_comp_snd // ]
+        |@O_plus @le_to_O [//|#n >fst_pair >snd_pair //]
+        ]
+      ]
+    ]
+  |@O_plus 
+    [@O_plus 
+      [@le_to_O #n @sU_le 
+      |@(O_trans … (λx.MSC (max (fst x) (snd x))))
+        [%{2} %{0} #x #_ cases (surj_pair x) #a * #b #eqx >eqx
+         >fst_pair >snd_pair @(transitive_le … (MSC_pair …)) 
+         whd in ⊢ (??%); @le_plus 
+          [@monotonic_MSC @(le_maxl … (le_n …)) 
+          |>commutative_times <times_n_1 @monotonic_MSC @(le_maxr … (le_n …))  
+          ]
+        |@le_to_O #x @(transitive_le ???? (sU_le_i … )) //
+        ]
+      ]
+    |@le_to_O #x @monotonic_sU [@(le_maxl … (le_n …))|//|//]
+  ]
+qed.
+
+(*
+lemma compl_g81: ∀h.
+  (∀x.MSC x≤h (S (fst x)) (snd(snd x))) →
+  constructible (λx. h (fst x) (snd x)) →
+  CF (λx. sU 〈max (fst x) (snd x),〈snd (snd x),h (S (fst x)) (snd (snd x))〉〉)
+    (λp:ℕ.out (fst p) (snd (snd p)) (h (S (fst p)) (snd (snd p)))).
+#h #hle #hconstr @(monotonic_CF ???? (compl_g8 h hle hconstr)) #x @monotonic_sU // @(le_maxl … (le_n … )) 
+qed. *)
+
+(* axiom daemon : False. *)
+
+lemma compl_g9 : ∀h. 
+  constructible (λx. h (fst x) (snd x)) →
+  (∀n. monotonic ? le (h n)) → 
+  (∀n,a,b. a ≤ b → b ≤ n → h b n ≤ h a n) →
+  CF (λx. (S (snd x-fst x))*MSC 〈x,x〉 + 
+      (snd x-fst x)*(S(snd x-fst x))*sU 〈x,〈snd x,h (S (fst x)) (snd x)〉〉)
+   (auxg h).
+#h #hconstr #hmono #hantimono 
+@(compl_g2 h ??? (compl_g3 … (compl_g71 h hconstr hmono)) (compl_g8 h hconstr))
+@O_plus 
+  [@O_plus_l @le_to_O #x >(times_n_1 (MSC x)) >commutative_times @le_times
+    [// | @monotonic_MSC // ]]
+@(O_trans … (coroll2 ??))
+  [#n #a #b #leab #ltb >fst_pair >fst_pair >snd_pair >snd_pair
+   cut (b ≤ n) [@(transitive_le … (le_snd …)) @lt_to_le //] #lebn
+   cut (max a n = n) 
+    [normalize >le_to_leb_true [//|@(transitive_le … leab lebn)]] #maxa
+   cut (max b n = n) [normalize >le_to_leb_true //] #maxb
+   @le_plus
+    [@le_plus [>big_def >big_def >maxa >maxb //]
+     @le_times 
+      [/2 by monotonic_le_minus_r/ 
+      |@monotonic_sU // @hantimono [@le_S_S // |@ltb] 
+      ]
+    |@monotonic_sU // @hantimono [@le_S_S // |@ltb]
+    ] 
+  |@le_to_O #n >fst_pair >snd_pair
+   cut (max (fst n) n = n) [normalize >le_to_leb_true //] #Hmax >Hmax
+   >associative_plus >distributive_times_plus
+   @le_plus [@le_times [@le_S // |>big_def >Hmax //] |//] 
+  ]
+qed.
+
+definition sg ≝ λh,x.
+  (S (snd x-fst x))*MSC 〈x,x〉 + (snd x-fst x)*(S(snd x-fst x))*sU 〈x,〈snd x,h (S (fst x)) (snd x)〉〉.
+
+lemma sg_def : ∀h,a,b. 
+  sg h 〈a,b〉 = (S (b-a))*MSC 〈〈a,b〉,〈a,b〉〉 + 
+   (b-a)*(S(b-a))*sU 〈〈a,b〉,〈b,h (S a) b〉〉.
+#h #a #b whd in ⊢ (??%?); >fst_pair >snd_pair // 
+qed. 
+
+lemma compl_g11 : ∀h.
+  constructible (λx. h (fst x) (snd x)) →
+  (∀n. monotonic ? le (h n)) → 
+  (∀n,a,b. a ≤ b → b ≤ n → h b n ≤ h a n) →
+  CF (sg h) (unary_g h).
+#h #hconstr #Hm #Ham @compl_g1 @(compl_g9 h hconstr Hm Ham)
+qed. 
+
+(**************************** closing the argument ****************************)
+
+let rec h_of_aux (r:nat →nat) (c,d,b:nat) on d : nat ≝ 
+  match d with 
+  [ O ⇒ c (* MSC 〈〈b,b〉,〈b,b〉〉 *)
+  | S d1 ⇒ (S d)*(MSC 〈〈b-d,b〉,〈b-d,b〉〉) +
+     d*(S d)*sU 〈〈b-d,b〉,〈b,r (h_of_aux r c d1 b)〉〉].
+
+lemma h_of_aux_O: ∀r,c,b.
+  h_of_aux r c O b  = c.
+// qed.
+
+lemma h_of_aux_S : ∀r,c,d,b. 
+  h_of_aux r c (S d) b = 
+    (S (S d))*(MSC 〈〈b-(S d),b〉,〈b-(S d),b〉〉) + 
+      (S d)*(S (S d))*sU 〈〈b-(S d),b〉,〈b,r(h_of_aux r c d b)〉〉.
+// qed.
+
+definition h_of ≝ λr,p. 
+  let m ≝ max (fst p) (snd p) in 
+  h_of_aux r (MSC 〈〈m,m〉,〈m,m〉〉) (snd p - fst p) (snd p).
+
+lemma h_of_O: ∀r,a,b. b ≤ a → 
+  h_of r 〈a,b〉 = let m ≝ max a b in MSC 〈〈m,m〉,〈m,m〉〉.
+#r #a #b #Hle normalize >fst_pair >snd_pair >(minus_to_0 … Hle) //
+qed.
+
+lemma h_of_def: ∀r,a,b.h_of r 〈a,b〉 = 
+  let m ≝ max a b in 
+  h_of_aux r (MSC 〈〈m,m〉,〈m,m〉〉) (b - a) b.
+#r #a #b normalize >fst_pair >snd_pair //
+qed.
+  
+lemma mono_h_of_aux: ∀r.(∀x. x ≤ r x) → monotonic ? le r →
+  ∀d,d1,c,c1,b,b1.c ≤ c1 → d ≤ d1 → b ≤ b1 → 
+  h_of_aux r c d b ≤ h_of_aux r c1 d1 b1.
+#r #Hr #monor #d #d1 lapply d -d elim d1 
+  [#d #c #c1 #b #b1 #Hc #Hd @(le_n_O_elim ? Hd) #leb 
+   >h_of_aux_O >h_of_aux_O  //
+  |#m #Hind #d #c #c1 #b #b1 #lec #led #leb cases (le_to_or_lt_eq … led)
+    [#ltd @(transitive_le … (Hind … lec ? leb)) [@le_S_S_to_le @ltd]
+     >h_of_aux_S @(transitive_le ???? (le_plus_n …))
+     >(times_n_1 (h_of_aux r c1 m b1)) in ⊢ (?%?); 
+     >commutative_times @le_times [//|@(transitive_le … (Hr ?)) @sU_le]
+    |#Hd >Hd >h_of_aux_S >h_of_aux_S 
+     cut (b-S m ≤ b1 - S m) [/2 by monotonic_le_minus_l/] #Hb1
+     @le_plus [@le_times //] 
+      [@monotonic_MSC @le_pair @le_pair //
+      |@le_times [//] @monotonic_sU 
+        [@le_pair // |// |@monor @Hind //]
+      ]
+    ]
+  ]
+qed.
+
+lemma mono_h_of2: ∀r.(∀x. x ≤ r x) → monotonic ? le r →
+  ∀i,b,b1. b ≤ b1 → h_of r 〈i,b〉 ≤ h_of r 〈i,b1〉.
+#r #Hr #Hmono #i #a #b #leab >h_of_def >h_of_def
+cut (max i a ≤ max i b)
+  [@to_max 
+    [@(le_maxl … (le_n …))|@(transitive_le … leab) @(le_maxr … (le_n …))]]
+#Hmax @(mono_h_of_aux r Hr Hmono) 
+  [@monotonic_MSC @le_pair @le_pair @Hmax |/2 by monotonic_le_minus_l/ |@leab]
+qed.
+
+axiom h_of_constr : ∀r:nat →nat. 
+  (∀x. x ≤ r x) → monotonic ? le r → constructible r →
+  constructible (h_of r).
+
+lemma speed_compl: ∀r:nat →nat. 
+  (∀x. x ≤ r x) → monotonic ? le r → constructible r →
+  CF (h_of r) (unary_g (λi,x. r(h_of r 〈i,x〉))).
+#r #Hr #Hmono #Hconstr @(monotonic_CF … (compl_g11 …)) 
+  [#x cases (surj_pair x) #a * #b #eqx >eqx 
+   >sg_def cases (decidable_le b a)
+    [#leba >(minus_to_0 … leba) normalize in ⊢ (?%?);
+     <plus_n_O <plus_n_O >h_of_def 
+     cut (max a b = a) 
+      [normalize cases (le_to_or_lt_eq … leba)
+        [#ltba >(lt_to_leb_false … ltba) % 
+        |#eqba <eqba >(le_to_leb_true … (le_n ?)) % ]]
+     #Hmax >Hmax normalize >(minus_to_0 … leba) normalize
+     @monotonic_MSC @le_pair @le_pair //
+    |#ltab >h_of_def >h_of_def
+     cut (max a b = b) 
+      [normalize >(le_to_leb_true … ) [%] @lt_to_le @not_le_to_lt @ltab]
+     #Hmax >Hmax 
+     cut (max (S a) b = b) 
+      [whd in ⊢ (??%?);  >(le_to_leb_true … ) [%] @not_le_to_lt @ltab]
+     #Hmax1 >Hmax1
+     cut (∃d.b - a = S d) 
+       [%{(pred(b-a))} >S_pred [//] @lt_plus_to_minus_r @not_le_to_lt @ltab] 
+     * #d #eqd >eqd  
+     cut (b-S a = d) [//] #eqd1 >eqd1 >h_of_aux_S >eqd1 
+     cut (b - S d = a) 
+       [@plus_to_minus >commutative_plus @minus_to_plus 
+         [@lt_to_le @not_le_to_lt // | //]] #eqd2 >eqd2
+     normalize //
+    ]
+  |#n #a #b #leab #lebn >h_of_def >h_of_def
+   cut (max a n = n) 
+    [normalize >le_to_leb_true [%|@(transitive_le … leab lebn)]] #Hmaxa
+   cut (max b n = n) 
+    [normalize >(le_to_leb_true … lebn) %] #Hmaxb 
+   >Hmaxa >Hmaxb @Hmono @(mono_h_of_aux r … Hr Hmono) // /2 by monotonic_le_minus_r/
+  |#n #a #b #leab @Hmono @(mono_h_of2 … Hr Hmono … leab)
+  |@(constr_comp … Hconstr Hr) @(ext_constr (h_of r))
+    [#x cases (surj_pair x) #a * #b #eqx >eqx >fst_pair >snd_pair //]  
+   @(h_of_constr r Hr Hmono Hconstr)
+  ]
+qed.
+
+(* 
+lemma unary_g_def : ∀h,i,x. g h i x = unary_g h 〈i,x〉.
+#h #i #x whd in ⊢ (???%); >fst_pair >snd_pair %
+qed.  *)
+
+(* smn *)
+axiom smn: ∀f,s. CF s f → ∀x. CF (λy.s 〈x,y〉) (λy.f 〈x,y〉).
+
+lemma speed_compl_i: ∀r:nat →nat. 
+  (∀x. x ≤ r x) → monotonic ? le r → constructible r →
+  ∀i. CF (λx.h_of r 〈i,x〉) (λx.g (λi,x. r(h_of r 〈i,x〉)) i x).
+#r #Hr #Hmono #Hconstr #i 
+@(ext_CF (λx.unary_g (λi,x. r(h_of r 〈i,x〉)) 〈i,x〉))
+  [#n whd in ⊢ (??%%); @eq_f @sym_eq >fst_pair >snd_pair %]
+@smn @(ext_CF … (speed_compl r Hr Hmono Hconstr)) #n //
+qed.
+
+theorem pseudo_speedup: 
+  ∀r:nat →nat. (∀x. x ≤ r x) → monotonic ? le r → constructible r →
+  ∃f.∀sf. CF sf f → ∃g,sg. f ≈ g ∧ CF sg g ∧ O sf (r ∘ sg).
+(* ∃m,a.∀n. a≤n → r(sg a) < m * sf n. *)
+#r #Hr #Hmono #Hconstr
+(* f is (g (λi,x. r(h_of r 〈i,x〉)) 0) *) 
+%{(g (λi,x. r(h_of r 〈i,x〉)) 0)} #sf * #H * #i *
+#Hcodei #HCi 
+(* g is (g (λi,x. r(h_of r 〈i,x〉)) (S i)) *)
+%{(g (λi,x. r(h_of r 〈i,x〉)) (S i))}
+(* sg is (λx.h_of r 〈i,x〉) *)
+%{(λx. h_of r 〈S i,x〉)}
+lapply (speed_compl_i … Hr Hmono Hconstr (S i)) #Hg
+%[%[@condition_1 |@Hg]
+ |cases Hg #H1 * #j * #Hcodej #HCj
+  lapply (condition_2 … Hcodei) #Hcond2 (* @not_to_not *)
+  cases HCi #m * #a #Ha %{m} %{(max (S i) a)} #n #ltin @lt_to_le @not_le_to_lt 
+  @(not_to_not … Hcond2) -Hcond2 #Hlesf %{n} % 
+  [@(transitive_le … ltin) @(le_maxl … (le_n …))]
+  cases (Ha n ?) [2: @(transitive_le … ltin) @(le_maxr … (le_n …))] 
+  #y #Uy %{y} @(monotonic_U … Uy) @(transitive_le … Hlesf) //
+ ]
+qed.
+
+theorem pseudo_speedup': 
+  ∀r:nat →nat. (∀x. x ≤ r x) → monotonic ? le r → constructible r →
+  ∃f.∀sf. CF sf f → ∃g,sg. f ≈ g ∧ CF sg g ∧ 
+  (* ¬ O (r ∘ sg) sf. *)
+  ∃m,a.∀n. a≤n → r(sg a) < m * sf n. 
+#r #Hr #Hmono #Hconstr 
+(* f is (g (λi,x. r(h_of r 〈i,x〉)) 0) *) 
+%{(g (λi,x. r(h_of r 〈i,x〉)) 0)} #sf * #H * #i *
+#Hcodei #HCi 
+(* g is (g (λi,x. r(h_of r 〈i,x〉)) (S i)) *)
+%{(g (λi,x. r(h_of r 〈i,x〉)) (S i))}
+(* sg is (λx.h_of r 〈i,x〉) *)
+%{(λx. h_of r 〈S i,x〉)}
+lapply (speed_compl_i … Hr Hmono Hconstr (S i)) #Hg
+%[%[@condition_1 |@Hg]
+ |cases Hg #H1 * #j * #Hcodej #HCj
+  lapply (condition_2 … Hcodei) #Hcond2 (* @not_to_not *)
+  cases HCi #m * #a #Ha
+  %{m} %{(max (S i) a)} #n #ltin @not_le_to_lt @(not_to_not … Hcond2) -Hcond2 #Hlesf 
+  %{n} % [@(transitive_le … ltin) @(le_maxl … (le_n …))]
+  cases (Ha n ?) [2: @(transitive_le … ltin) @(le_maxr … (le_n …))] 
+  #y #Uy %{y} @(monotonic_U … Uy) @(transitive_le … Hlesf)
+  @Hmono @(mono_h_of2 … Hr Hmono … ltin)
+ ]
+qed.
+