include "sandwich.ma".
include "property_exhaustivity.ma".
+(* NOT DUALIZED *)
+alias symbol "low" = "lower".
+alias id "le" = "cic:/matita/dama/ordered_set/le.con".
lemma order_converges_bigger_lowsegment:
∀C:ordered_set.
- ∀a:sequence C.∀l,u:C.∀H:∀i:nat.a i ∈ [l,u].
- ∀x:C.∀p:a order_converges x.
- ∀j.l ≤ (pi1exT23 ???? p) j.
+ ∀a:sequence (os_l C).∀s:segment C.∀H:∀i:nat.a i ∈ s.
+ ∀x:C.∀p:order_converge C a x.
+ ∀j. seg_l (os_l C) s (λl.le (os_l C) l (pi1exT23 ???? p j)).
intros; cases p (xi yi Ux Dy Hxy); clear p; simplify;
cases Ux (Ixi Sxi); clear Ux; cases Dy (Dyi Iyi); clear Dy;
cases (Hxy j) (Ia Sa); clear Hxy; cases Ia (Da SSa); cases Sa (Inca SIa); clear Ia Sa;
-intro H2; cases (SSa l H2) (w Hw); simplify in Hw;
-cases (H (w+j)) (Hal Hau); apply (Hau Hw);
+cases (wloss_prop (os_l C))(W W);rewrite <W;
+[ intro H2; cases (SSa (seg_l_ C s) H2) (w Hw); simplify in Hw;
+ lapply (H (w+j)) as K; unfold in K;
+ whd in K:(? % ? ? ? ?); simplify in K:(%); rewrite <W in K; cases K;
+ whd in H1:(? % ? ? ? ?); simplify in H1:(%); rewrite <W in H1;
+ simplify in H1; apply (H1 Hw);
+| intro H2; cases (SSa (seg_u_ C s) H2) (w Hw); simplify in Hw;
+ lapply (H (w+j)) as K; unfold in K;
+ whd in K:(? % ? ? ? ?);simplify in K:(%); rewrite <W in K; cases K;
+ whd in H3:(? % ? ? ? ?);simplify in H3:(%); rewrite <W in H3;
+ simplify in H3; apply (H3 Hw);]
qed.
-
+
lemma order_converges_smaller_upsegment:
∀C:ordered_set.
- ∀a:sequence C.∀l,u:C.∀H:∀i:nat.a i ∈ [l,u].
- ∀x:C.∀p:a order_converges x.
- ∀j.(pi2exT23 ???? p) j ≤ u.
-intros; cases p; clear p; simplify; cases H1; clear H1; cases H2; clear H2;
-cases (H3 j); clear H3; cases H2; cases H7; clear H2 H7;
-intro H2; cases (H10 ? H2);
-cases (H (w1+j)); apply (H11 H7);
-qed.
-
+ ∀a:sequence (os_l C).∀s:segment C.∀H:∀i:nat.a i ∈ s.
+ ∀x:C.∀p:order_converge C a x.
+ ∀j. seg_u (os_l C) s (λu.le (os_l C) (pi2exT23 ???? p j) u).
+intros; cases p (xi yi Ux Dy Hxy); clear p; simplify;
+cases Ux (Ixi Sxi); clear Ux; cases Dy (Dyi Iyi); clear Dy;
+cases (Hxy j) (Ia Sa); clear Hxy; cases Ia (Da SSa); cases Sa (Inca SIa); clear Ia Sa;
+cases (wloss_prop (os_l C))(W W); unfold os_r; unfold dual_hos; simplify;rewrite <W;
+[ intro H2; cases (SIa (seg_u_ (os_l C) s) H2) (w Hw); simplify in Hw;
+ lapply (H (w+j)) as K; unfold in K; whd in K:(? % ? ? ? ?); simplify in K:(%);
+ rewrite <W in K; cases K; whd in H3:(? % ? ? ? ?); simplify in H3:(%); rewrite <W in H3;
+ simplify in H3; apply (H3 Hw);
+| intro H2; cases (SIa (seg_l_ C s) H2) (w Hw); simplify in Hw;
+ lapply (H (w+j)) as K; unfold in K; whd in K:(? % ? ? ? ?); simplify in K:(%);
+ rewrite <W in K; cases K; whd in H1:(? % ? ? ? ?); simplify in H1:(%);
+ rewrite <W in H1; simplify in H1; apply (H1 Hw);]
+qed.
+
+alias symbol "upp" = "uppper".
+alias symbol "leq" = "Ordered set less or equal than".
+lemma cases_in_segment:
+ ∀C:half_ordered_set.∀s:segment C.∀x. x ∈ s → seg_l C s (λl.l ≤≤ x) ∧ seg_u C s (λu.x ≤≤ u).
+intros; unfold in H; cases (wloss_prop C) (W W); rewrite<W in H; [cases H; split;assumption]
+cases H; split; assumption;
+qed.
+
+lemma trans_under_upp:
+ ∀O:ordered_set.∀s:‡O.∀x,y:O.
+ x ≤ y → 𝕦_s (λu.y ≤ u) → 𝕦_s (λu.x ≤ u).
+intros; cases (wloss_prop (os_l O)) (W W); unfold; unfold in H1; rewrite<W in H1 ⊢ %;
+apply (le_transitive ??? H H1);
+qed.
+
+lemma trans_under_low:
+ ∀O:ordered_set.∀s:‡O.∀x,y:O.
+ y ≤ x → 𝕝_s (λl.l ≤ y) → 𝕝_s (λl.l ≤ x).
+intros; cases (wloss_prop (os_l O)) (W W); unfold; unfold in H1; rewrite<W in H1 ⊢ %;
+apply (le_transitive ??? H1 H);
+qed.
+
+lemma l2sl:
+ ∀C,s.∀x,y:half_segment_ordered_set C s. \fst x ≤≤ \fst y → x ≤≤ y.
+intros; unfold in H ⊢ %; intro; apply H; clear H; unfold in H1 ⊢ %;
+cases (wloss_prop C) (W W); whd in H1:(? (% ? ?) ? ? ? ?); simplify in H1:(%);
+rewrite < W in H1 ⊢ %; apply H1;
+qed.
+
(* Theorem 3.10 *)
theorem lebesgue_oc:
∀C:ordered_uniform_space.
- (∀l,u:C.order_continuity {[l,u]}) →
- ∀a:sequence C.∀l,u:C.∀H:∀i:nat.a i ∈ [l,u].
+ (∀s:‡C.order_continuity {[s]}) →
+ ∀a:sequence C.∀s:‡C.∀H:∀i:nat.a i ∈ s.
∀x:C.a order_converges x →
- x ∈ [l,u] ∧
- ∀h:x ∈ [l,u].
- uniform_converge {[l,u]} (⌊n,≪a n,H n≫⌋) ≪x,h≫.
+ x ∈ s ∧
+ ∀h:x ∈ s.
+ uniform_converge {[s]} (⌊n,≪a n,H n≫⌋) ≪x,h≫.
intros;
-generalize in match (order_converges_bigger_lowsegment ???? H1 ? H2);
-generalize in match (order_converges_smaller_upsegment ???? H1 ? H2);
-cases H2 (xi yi Hx Hy Hxy); clear H2; simplify in ⊢ (% → % → ?); intros;
-cut (∀i.xi i ∈ [l,u]) as Hxi; [2:
- intros; split; [2:apply H3] cases (Hxy i) (H5 _); cases H5 (H7 _);
- apply (ge_transitive u ??? (H7 0)); simplify;
- cases (H1 i); assumption;] clear H3;
-cut (∀i.yi i ∈ [l,u]) as Hyi; [2:
- intros; split; [apply H2] cases (Hxy i) (_ H5); cases H5 (H7 _);
- apply (le_transitive l ? (yi i) ? (H7 0)); simplify;
- cases (H1 i); assumption;] clear H2;
+generalize in match (order_converges_bigger_lowsegment ? a s H1 ? H2);
+generalize in match (order_converges_smaller_upsegment ? a s H1 ? H2);
+cases H2 (xi yi Hx Hy Hxy); clear H2; simplify in ⊢ ((?→???%) → (?→???%) → ?); intros;
+cut (∀i.xi i ∈ s) as Hxi; [2:
+ intros; apply (prove_in_segment (os_l C)); [apply (H3 i)] cases (Hxy i) (H5 _); cases H5 (H7 _);
+ lapply (H7 0) as K; cases (cases_in_segment ? s ? (H1 i)) (Pl Pu); simplify in K;
+ apply (trans_under_upp ?? (xi i) (a i) K Pu);] clear H3;
+cut (∀i.yi i ∈ s) as Hyi; [2:
+ intros; apply (prove_in_segment (os_l C)); [2:apply (H2 i)] cases (Hxy i) (_ H5); cases H5 (H7 _);
+ lapply (H7 0) as K; cases (cases_in_segment ? s ? (H1 i)) (Pl Pu); simplify in K;
+ apply (trans_under_low ?? (yi i) (a i) K Pl);] clear H2;
split;
-[1: cases Hx; cases H3; cases Hy; cases H7; split;
- [1: apply (ge_transitive u ?? ? (H8 0)); cases (Hyi 0); assumption
- |2: apply (le_transitive l ? x ? (H4 0)); cases (Hxi 0); assumption]
+[1: apply (uparrow_to_in_segment s ? Hxi ? Hx);
|2: intros 3 (h);
letin Xi ≝ (⌊n,≪xi n, Hxi n≫⌋);
letin Yi ≝ (⌊n,≪yi n, Hyi n≫⌋);
letin Ai ≝ (⌊n,≪a n, H1 n≫⌋);
- apply (sandwich {[l,u]} ≪?, h≫ Xi Yi Ai); [4: assumption;]
- [1: intro j; cases (Hxy j); cases H3; cases H4; split;
- [apply (H5 0);|apply (H7 0)]
- |2: cases (H l u Xi ≪?,h≫) (Ux Uy); apply Ux; cases Hx; split; [apply H3;]
- cases H4; split; [apply H5] intros (y Hy);cases (H6 (\fst y));[2:apply Hy];
- exists [apply w] apply H7;
- |3: cases (H l u Yi ≪?,h≫) (Ux Uy); apply Uy; cases Hy; split; [apply H3;]
- cases H4; split; [apply H5] intros (y Hy);cases (H6 (\fst y));[2:apply Hy];
- exists [apply w] apply H7;]]
+ apply (sandwich {[s]} ≪x, h≫ Xi Yi Ai); [4: assumption;]
+ [1: intro j; cases (Hxy j); cases H3; cases H4; split; clear H3 H4; simplify in H5 H7;
+ [apply (l2sl ? s (Xi j) (Ai j) (H5 0));|apply (l2sl ? s (Ai j) (Yi j) (H7 0))]
+ |2: cases (H s Xi ≪?,h≫) (Ux Uy); apply Ux; cases Hx; split; [intro i; apply (l2sl ? s (Xi i) (Xi (S i)) (H3 i));]
+ cases H4; split; [intro i; apply (l2sl ? s (Xi i) ≪x,h≫ (H5 i))]
+ intros (y Hy);cases (H6 (\fst y));[2:apply (sx2x ? s ? y Hy)]
+ exists [apply w] apply (x2sx ? s (Xi w) y H7);
+ |3: cases (H s Yi ≪?,h≫) (Ux Uy); apply Uy; cases Hy; split; [intro i; apply (l2sl ? s (Yi (S i)) (Yi i) (H3 i));]
+ cases H4; split; [intro i; apply (l2sl ? s ≪x,h≫ (Yi i) (H5 i))]
+ intros (y Hy);cases (H6 (\fst y));[2:apply (sx2x ? s y ≪x,h≫ Hy)]
+ exists [apply w] apply (x2sx ? s y (Yi w) H7);]]
qed.
(* Theorem 3.9 *)
theorem lebesgue_se:
∀C:ordered_uniform_space.property_sigma C →
- (∀l,u:C.exhaustive {[l,u]}) →
- ∀a:sequence C.∀l,u:C.∀H:∀i:nat.a i ∈ [l,u].
+ (∀s:‡C.exhaustive {[s]}) →
+ ∀a:sequence C.∀s:‡C.∀H:∀i:nat.a i ∈ s.
∀x:C.a order_converges x →
- x ∈ [l,u] ∧
- ∀h:x ∈ [l,u].
- uniform_converge {[l,u]} (⌊n,≪a n,H n≫⌋) ≪x,h≫.
+ x ∈ s ∧
+ ∀h:x ∈ s.
+ uniform_converge {[s]} (⌊n,≪a n,H n≫⌋) ≪x,h≫.
intros (C S);
-generalize in match (order_converges_bigger_lowsegment ???? H1 ? H2);
-generalize in match (order_converges_smaller_upsegment ???? H1 ? H2);
-cases H2 (xi yi Hx Hy Hxy); clear H2; simplify in ⊢ (% → % → ?); intros;
-cut (∀i.xi i ∈ [l,u]) as Hxi; [2:
- intros; split; [2:apply H3] cases (Hxy i) (H5 _); cases H5 (H7 _);
- apply (ge_transitive u ?? ? (H7 0)); simplify;
- cases (H1 i); assumption;] clear H3;
-cut (∀i.yi i ∈ [l,u]) as Hyi; [2:
- intros; split; [apply H2] cases (Hxy i) (_ H5); cases H5 (H7 _);
- apply (le_transitive l ? (yi i) ? (H7 0)); simplify;
- cases (H1 i); assumption;] clear H2;
+generalize in match (order_converges_bigger_lowsegment ? a s H1 ? H2);
+generalize in match (order_converges_smaller_upsegment ? a s H1 ? H2);
+cases H2 (xi yi Hx Hy Hxy); clear H2; simplify in ⊢ ((?→???%) → (?→???%) → ?); intros;
+cut (∀i.xi i ∈ s) as Hxi; [2:
+ intros; apply (prove_in_segment (os_l C)); [apply (H3 i)] cases (Hxy i) (H5 _); cases H5 (H7 _);
+ lapply (H7 0) as K; cases (cases_in_segment ? s ? (H1 i)) (Pl Pu); simplify in K;
+ apply (trans_under_upp ?? (xi i) (a i) K Pu);] clear H3;
+cut (∀i.yi i ∈ s) as Hyi; [2:
+ intros; apply (prove_in_segment (os_l C)); [2:apply (H2 i)] cases (Hxy i) (_ H5); cases H5 (H7 _);
+ lapply (H7 0) as K; cases (cases_in_segment ? s ? (H1 i)) (Pl Pu); simplify in K;
+ apply (trans_under_low ?? (yi i) (a i) K Pl);] clear H2;
letin Xi ≝ (⌊n,≪xi n, Hxi n≫⌋);
letin Yi ≝ (⌊n,≪yi n, Hyi n≫⌋);
-cases (restrict_uniform_convergence_uparrow ? S ?? (H l u) Xi x Hx);
-cases (restrict_uniform_convergence_downarrow ? S ?? (H l u) Yi x Hy);
+cases (restrict_uniform_convergence_uparrow ? S ? (H s) Xi x Hx);
+cases (restrict_uniform_convergence_downarrow ? S ? (H s) Yi x Hy);
split; [1: assumption]
intros 3;
lapply (uparrow_upperlocated xi x Hx)as Ux;
lapply (downarrow_lowerlocated yi x Hy)as Uy;
letin Ai ≝ (⌊n,≪a n, H1 n≫⌋);
-apply (sandwich {[l,u]} ≪?, h≫ Xi Yi Ai); [4: assumption;|2:apply H3;|3:apply H5]
-intro j; cases (Hxy j); cases H7; cases H8; split; [apply (H9 0);|apply (H11 0)]
+apply (sandwich {[s]} ≪x, h≫ Xi Yi Ai); [4: assumption;|2:apply H3;|3:apply H5]
+intro j; cases (Hxy j); cases H7; cases H8; split;
+[apply (l2sl ? s (Xi j) (Ai j) (H9 0));|apply (l2sl ? s (Ai j) (Yi j) (H11 0))]
qed.
(b is_decreasing → b is_lower_located → b is_cauchy).
lemma prove_in_segment:
- ∀O:ordered_set.∀s:segment (os_l O).∀x:O.
- 𝕝_s (λl.l ≤ x) → 𝕦_s (λu.x ≤ u) → x ∈ s.
-intros; unfold; cases (wloss_prop (os_l O)); rewrite < H2;
+ ∀O:half_ordered_set.∀s:segment O.∀x:O.
+ seg_l O s (λl.l ≤≤ x) → seg_u O s (λu.x ≤≤ u) → x ∈ s.
+intros; unfold; cases (wloss_prop O); rewrite < H2;
split; assumption;
qed.
-lemma under_wloss_upperbound:
- ∀C:half_ordered_set.∀s:segment C.∀a:sequence C.
- seg_u C s (upper_bound C a) →
- ∀i.seg_u C s (λu.a i ≤≤ u).
-intros; unfold in H; unfold;
-cases (wloss_prop C); rewrite <H1 in H ⊢ %;
-apply (H i);
-qed.
+lemma h_uparrow_to_in_segment:
+ ∀C:half_ordered_set.
+ ∀s:segment C.
+ ∀a:sequence C.
+ (∀i.a i ∈ s) →
+ ∀x:C. uparrow C a x →
+ in_segment C s x.
+intros (C H a H1 x H2); unfold in H2; cases H2; clear H2;unfold in H3 H4; cases H4; clear H4; unfold in H2;
+cases (wloss_prop C) (W W); apply prove_in_segment; unfold; rewrite <W;simplify;
+[ apply (hle_transitive ??? x ? (H2 O)); lapply (H1 O) as K; unfold in K; rewrite <W in K;
+ cases K; unfold in H4 H6; rewrite <W in H6 H4; simplify in H4 H6; assumption;
+| intro; cases (H5 ? H4); clear H5 H4;lapply(H1 w) as K; unfold in K; rewrite<W in K;
+ cases K; unfold in H5 H4; rewrite<W in H4 H5; simplify in H4 H5; apply (H5 H6);
+| apply (hle_transitive ??? x ? (H2 O)); lapply (H1 0) as K; unfold in K; rewrite <W in K;
+ cases K; unfold in H4 H6; rewrite <W in H4 H6; simplify in H4 H6; assumption;
+| intro; cases (H5 ? H4); clear H5 H4;lapply(H1 w) as K; unfold in K; rewrite<W in K;
+ cases K; unfold in H5 H4; rewrite<W in H4 H5; simplify in H4 H5; apply (H4 H6);]
+qed.
+notation "'uparrow_to_in_segment'" non associative with precedence 90 for @{'uparrow_to_in_segment}.
+notation "'downarrow_to_in_segment'" non associative with precedence 90 for @{'downarrow_to_in_segment}.
+interpretation "uparrow_to_in_segment" 'uparrow_to_in_segment = (h_uparrow_to_in_segment (os_l _)).
+interpretation "downarrow_to_in_segment" 'downarrow_to_in_segment = (h_uparrow_to_in_segment (os_r _)).
+
(* Lemma 3.8 NON DUALIZZATO *)
lemma restrict_uniform_convergence_uparrow:
∀C:ordered_uniform_space.property_sigma C →
∀x:C. ⌊n,\fst (a n)⌋ ↑ x →
in_segment (os_l C) s x ∧ ∀h:x ∈ s.a uniform_converges ≪x,h≫.
intros; split;
-[1: unfold in H2; cases H2; clear H2;unfold in H3 H4; cases H4; clear H4; unfold in H2;
- cases (wloss_prop (os_l C)) (W W); apply prove_in_segment; unfold; rewrite <W;
- simplify;
- [ apply (le_transitive ?? x ? (H2 O));
- lapply (under_wloss_upperbound (os_r C) ?? (h_segment_upperbound (os_r C) s a) O) as K;
- unfold in K; whd in K:(?%????); simplify in K; rewrite <W in K; apply K;
- | intro; cases (H5 ? H4); clear H5 H4;
- lapply (under_wloss_upperbound (os_l C) ?? (segment_upperbound s a) w) as K;
- unfold in K; whd in K:(?%????); simplify in K; rewrite <W in K;
- apply K; apply H6;
- | intro; unfold in H4; rewrite <W in H4;
- lapply depth=0 (H5 (seg_u_ (os_l C) s)) as k; unfold in k:(%???→?);
- simplify in k; rewrite <W in k; lapply (k
- simplify;intro; cases (H5 ? H4); clear H5 H4;
- lapply (under_wloss_upperbound (os_l C) ?? (segment_upperbound s a) w) as K;
- unfold in K; whd in K:(?%????); simplify in K; rewrite <W in K;
- apply K; apply H6;
-
-
-
- cases H2 (Ha Hx); clear H2; cases Hx; split;
- lapply depth=0 (under_wloss_upperbound (os_l C) ?? (segment_upperbound s a) O) as W1;
- lapply depth=0 (under_wloss_upperbound (os_r C) ?? (h_segment_upperbound (os_r C) s a) O) as W2;
- lapply (H2 O); simplify in Hletin; simplify in W2 W1;
- cases a in Hletin W2 W1; simplify; cases (f O); simplify; intros;
- whd in H6:(? % ? ? ? ?);
- simplify in H6:(%);
- cases (wloss_prop (os_l C)); rewrite <H8 in H5 H6 ⊢ %;
- [ change in H6 with (le (os_l C) (seg_l_ (os_l C) s) w);
- apply (le_transitive ??? H6 H7);
- | apply (le_transitive (seg_u_ (os_l C) s) w x H6 H7);
- |
- lapply depth=0 (supremum_is_upper_bound ? x Hx (seg_u_ (os_l C) s)) as K;
- lapply depth=0 (under_wloss_upperbound (os_l C) ?? (segment_upperbound s a));
- apply K; intro; lapply (Hletin n); unfold; unfold in Hletin1;
- rewrite < H8 in Hletin1; intro; apply Hletin1; clear Hletin1; apply H9;
- | lapply depth=0 (h_supremum_is_upper_bound (os_r C) ⌊n,\fst (a n)⌋ x Hx (seg_l_ (os_r C) s)) as K;
- lapply depth=0 (under_wloss_upperbound (os_r C) ?? (h_segment_upperbound (os_r C) s a));
- apply K; intro; lapply (Hletin n); unfold; unfold in Hletin1;
-whd in Hletin1:(? % ? ? ? ?);
-simplify in Hletin1:(%);
- rewrite < H8 in Hletin1; intro; apply Hletin1; clear Hletin1; apply H9;
-
-
- apply (segment_upperbound ? l);
- generalize in match (H2 O); generalize in match Hx; unfold supremum;
- unfold upper_bound; whd in ⊢ (?→%→?); rewrite < H4;
- split; unfold; rewrite < H4; simplify;
- [1: lapply (infimum_is_lower_bound ? ? Hx u);
-
-
-
-split;
- [1: apply (supremum_is_upper_bound ? x Hx u);
- apply (segment_upperbound ? l);
- |2: apply (le_transitive l ? x ? (H2 O));
- apply (segment_lowerbound ? l u a 0);]
+[1: apply (uparrow_to_in_segment s ⌊n,\fst (a \sub n)⌋ ? x H2);
+ simplify; intros; cases (a i); assumption;
|2: intros;
lapply (uparrow_upperlocated a ≪x,h≫) as Ha1;
- [2: apply (segment_preserves_uparrow C l u);split; assumption;]
- lapply (segment_preserves_supremum C l u a ≪?,h≫) as Ha2;
- [2:split; assumption]; cases Ha2; clear Ha2;
- cases (H1 a a); lapply (H6 H4 Ha1) as HaC;
- lapply (segment_cauchy ? l u ? HaC) as Ha;
- lapply (sigma_cauchy ? H ? x ? Ha); [left; split; assumption]
- apply restric_uniform_convergence; assumption;]
+ [2: apply (segment_preserves_uparrow s); assumption;]
+ lapply (segment_preserves_supremum s a ≪?,h≫ H2) as Ha2;
+ cases Ha2; clear Ha2;
+ cases (H1 a a); lapply (H5 H3 Ha1) as HaC;
+ lapply (segment_cauchy C s ? HaC) as Ha;
+ lapply (sigma_cauchy ? H ? x ? Ha); [left; assumption]
+ apply (restric_uniform_convergence C s ≪x,h≫ a Hletin)]
qed.
lemma hint_mah1:
coercion hint_mah4 nocomposites.
+lemma hint_mah5:
+ ∀C. segment (hos_carr (os_r C)) → segment (hos_carr (os_l C)).
+ intros; assumption; qed.
+
+coercion hint_mah5 nocomposites.
+
+lemma hint_mah6:
+ ∀C. segment (hos_carr (os_l C)) → segment (hos_carr (os_r C)).
+ intros; assumption; qed.
+
+coercion hint_mah6 nocomposites.
+
lemma restrict_uniform_convergence_downarrow:
∀C:ordered_uniform_space.property_sigma C →
- ∀l,u:C.exhaustive {[l,u]} →
- ∀a:sequence {[l,u]}.∀x: C. ⌊n,\fst (a n)⌋ ↓ x →
- x∈[l,u] ∧ ∀h:x ∈ [l,u].a uniform_converges ≪x,h≫.
-intros; cases H2 (Ha Hx); clear H2; cases Hx; split;
-[1: split;
- [2: apply (infimum_is_lower_bound ? x Hx l);
- apply (segment_lowerbound ? l u);
- |1: lapply (ge_transitive ? ? x ? (H2 O)); [apply u||assumption]
- apply (segment_upperbound ? l u a 0);]
+ ∀s:segment (os_l C).exhaustive (segment_ordered_uniform_space C s) →
+ ∀a:sequence (segment_ordered_uniform_space C s).
+ ∀x:C. ⌊n,\fst (a n)⌋ ↓ x →
+ in_segment (os_l C) s x ∧ ∀h:x ∈ s.a uniform_converges ≪x,h≫.
+intros; split;
+[1: apply (downarrow_to_in_segment s ⌊n,\fst (a n)⌋ ? x); [2: apply H2];
+ simplify; intros; cases (a i); assumption;
|2: intros;
lapply (downarrow_lowerlocated a ≪x,h≫) as Ha1;
- [2: apply (segment_preserves_downarrow ? l u);split; assumption;]
- lapply (segment_preserves_infimum C l u a ≪x,h≫) as Ha2;
- [2:split; assumption]; cases Ha2; clear Ha2;
- cases (H1 a a); lapply (H7 H4 Ha1) as HaC;
- lapply (segment_cauchy ? l u ? HaC) as Ha;
- lapply (sigma_cauchy ? H ? x ? Ha); [right; split; assumption]
- apply restric_uniform_convergence; assumption;]
+ [2: apply (segment_preserves_downarrow s a x h H2);]
+ lapply (segment_preserves_infimum s a ≪?,h≫ H2) as Ha2;
+ cases Ha2; clear Ha2;
+ cases (H1 a a); lapply (H6 H3 Ha1) as HaC;
+ lapply (segment_cauchy C s ? HaC) as Ha;
+ lapply (sigma_cauchy ? H ? x ? Ha); [right; assumption]
+ apply (restric_uniform_convergence C s ≪x,h≫ a Hletin)]
qed.
projects / helm.git / commitdiff