1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "basic_2/notation/relations/pred_6.ma".
16 include "basic_2/notation/relations/pred_5.ma".
17 include "basic_2/rt_transition/cpg.ma".
19 (* T-BOUND CONTEXT-SENSITIVE PARALLEL RT-TRANSITION FOR TERMS ***************)
21 (* Basic_2A1: includes: cpr *)
22 definition cpm (h) (G) (L) (n): relation2 term term ≝
23 λT1,T2. ∃∃c. 𝐑𝐓⦃n, c⦄ & ⦃G, L⦄ ⊢ T1 ⬈[eq_t, c, h] T2.
26 "t-bound context-sensitive parallel rt-transition (term)"
27 'PRed n h G L T1 T2 = (cpm h G L n T1 T2).
30 "context-sensitive parallel r-transition (term)"
31 'PRed h G L T1 T2 = (cpm h G L O T1 T2).
33 (* Basic properties *********************************************************)
35 lemma cpm_ess: ∀h,G,L,s. ⦃G, L⦄ ⊢ ⋆s ➡[1, h] ⋆(next h s).
36 /2 width=3 by cpg_ess, ex2_intro/ qed.
38 lemma cpm_delta: ∀n,h,G,K,V1,V2,W2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 →
39 ⬆*[1] V2 ≘ W2 → ⦃G, K.ⓓV1⦄ ⊢ #0 ➡[n, h] W2.
40 #n #h #G #K #V1 #V2 #W2 *
41 /3 width=5 by cpg_delta, ex2_intro/
44 lemma cpm_ell: ∀n,h,G,K,V1,V2,W2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 →
45 ⬆*[1] V2 ≘ W2 → ⦃G, K.ⓛV1⦄ ⊢ #0 ➡[↑n, h] W2.
46 #n #h #G #K #V1 #V2 #W2 *
47 /3 width=5 by cpg_ell, ex2_intro, isrt_succ/
50 lemma cpm_lref: ∀n,h,I,G,K,T,U,i. ⦃G, K⦄ ⊢ #i ➡[n, h] T →
51 ⬆*[1] T ≘ U → ⦃G, K.ⓘ{I}⦄ ⊢ #↑i ➡[n, h] U.
52 #n #h #I #G #K #T #U #i *
53 /3 width=5 by cpg_lref, ex2_intro/
56 (* Basic_2A1: includes: cpr_bind *)
57 lemma cpm_bind: ∀n,h,p,I,G,L,V1,V2,T1,T2.
58 ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ➡[n, h] T2 →
59 ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ➡[n, h] ⓑ{p,I}V2.T2.
60 #n #h #p #I #G #L #V1 #V2 #T1 #T2 * #cV #HcV #HV12 *
61 /5 width=5 by cpg_bind, isrt_max_O1, isr_shift, ex2_intro/
64 lemma cpm_appl: ∀n,h,G,L,V1,V2,T1,T2.
65 ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 →
66 ⦃G, L⦄ ⊢ ⓐV1.T1 ➡[n, h] ⓐV2.T2.
67 #n #h #G #L #V1 #V2 #T1 #T2 * #cV #HcV #HV12 *
68 /5 width=5 by isrt_max_O1, isr_shift, cpg_appl, ex2_intro/
71 lemma cpm_cast: ∀n,h,G,L,U1,U2,T1,T2.
72 ⦃G, L⦄ ⊢ U1 ➡[n, h] U2 → ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 →
73 ⦃G, L⦄ ⊢ ⓝU1.T1 ➡[n, h] ⓝU2.T2.
74 #n #h #G #L #U1 #U2 #T1 #T2 * #cU #HcU #HU12 *
75 /4 width=6 by cpg_cast, isrt_max_idem1, isrt_mono, ex2_intro/
78 (* Basic_2A1: includes: cpr_zeta *)
79 lemma cpm_zeta: ∀n,h,G,L,V,T1,T,T2. ⦃G, L.ⓓV⦄ ⊢ T1 ➡[n, h] T →
80 ⬆*[1] T2 ≘ T → ⦃G, L⦄ ⊢ +ⓓV.T1 ➡[n, h] T2.
81 #n #h #G #L #V #T1 #T #T2 *
82 /3 width=5 by cpg_zeta, isrt_plus_O2, ex2_intro/
85 (* Basic_2A1: includes: cpr_eps *)
86 lemma cpm_eps: ∀n,h,G,L,V,T1,T2. ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 → ⦃G, L⦄ ⊢ ⓝV.T1 ➡[n, h] T2.
87 #n #h #G #L #V #T1 #T2 *
88 /3 width=3 by cpg_eps, isrt_plus_O2, ex2_intro/
91 lemma cpm_ee: ∀n,h,G,L,V1,V2,T. ⦃G, L⦄ ⊢ V1 ➡[n, h] V2 → ⦃G, L⦄ ⊢ ⓝV1.T ➡[↑n, h] V2.
92 #n #h #G #L #V1 #V2 #T *
93 /3 width=3 by cpg_ee, isrt_succ, ex2_intro/
96 (* Basic_2A1: includes: cpr_beta *)
97 lemma cpm_beta: ∀n,h,p,G,L,V1,V2,W1,W2,T1,T2.
98 ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L⦄ ⊢ W1 ➡[h] W2 → ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[n, h] T2 →
99 ⦃G, L⦄ ⊢ ⓐV1.ⓛ{p}W1.T1 ➡[n, h] ⓓ{p}ⓝW2.V2.T2.
100 #n #h #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 * #riV #rhV #HV12 * #riW #rhW #HW12 *
101 /6 width=7 by cpg_beta, isrt_plus_O2, isrt_max, isr_shift, ex2_intro/
104 (* Basic_2A1: includes: cpr_theta *)
105 lemma cpm_theta: ∀n,h,p,G,L,V1,V,V2,W1,W2,T1,T2.
106 ⦃G, L⦄ ⊢ V1 ➡[h] V → ⬆*[1] V ≘ V2 → ⦃G, L⦄ ⊢ W1 ➡[h] W2 →
107 ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[n, h] T2 →
108 ⦃G, L⦄ ⊢ ⓐV1.ⓓ{p}W1.T1 ➡[n, h] ⓓ{p}W2.ⓐV2.T2.
109 #n #h #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 * #riV #rhV #HV1 #HV2 * #riW #rhW #HW12 *
110 /6 width=9 by cpg_theta, isrt_plus_O2, isrt_max, isr_shift, ex2_intro/
113 (* Basic properties with r-transition ***************************************)
115 (* Note: this is needed by cpms_ind_sn and cpms_ind_dx *)
116 (* Basic_1: includes by definition: pr0_refl *)
117 (* Basic_2A1: includes: cpr_atom *)
118 lemma cpr_refl: ∀h,G,L. reflexive … (cpm h G L 0).
119 /3 width=3 by cpg_refl, ex2_intro/ qed.
121 (* Basic inversion lemmas ***************************************************)
123 lemma cpm_inv_atom1: ∀n,h,J,G,L,T2. ⦃G, L⦄ ⊢ ⓪{J} ➡[n, h] T2 →
125 | ∃∃s. T2 = ⋆(next h s) & J = Sort s & n = 1
126 | ∃∃K,V1,V2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 & ⬆*[1] V2 ≘ T2 &
127 L = K.ⓓV1 & J = LRef 0
128 | ∃∃k,K,V1,V2. ⦃G, K⦄ ⊢ V1 ➡[k, h] V2 & ⬆*[1] V2 ≘ T2 &
129 L = K.ⓛV1 & J = LRef 0 & n = ↑k
130 | ∃∃I,K,T,i. ⦃G, K⦄ ⊢ #i ➡[n, h] T & ⬆*[1] T ≘ T2 &
131 L = K.ⓘ{I} & J = LRef (↑i).
132 #n #h #J #G #L #T2 * #c #Hc #H elim (cpg_inv_atom1 … H) -H *
133 [ #H1 #H2 destruct /4 width=1 by isrt_inv_00, or5_intro0, conj/
134 | #s #H1 #H2 #H3 destruct /4 width=3 by isrt_inv_01, or5_intro1, ex3_intro/
135 | #cV #K #V1 #V2 #HV12 #HVT2 #H1 #H2 #H3 destruct
136 /4 width=6 by or5_intro2, ex4_3_intro, ex2_intro/
137 | #cV #K #V1 #V2 #HV12 #HVT2 #H1 #H2 #H3 destruct
138 elim (isrt_inv_plus_SO_dx … Hc) -Hc // #k #Hc #H destruct
139 /4 width=9 by or5_intro3, ex5_4_intro, ex2_intro/
140 | #I #K #V2 #i #HV2 #HVT2 #H1 #H2 destruct
141 /4 width=8 by or5_intro4, ex4_4_intro, ex2_intro/
145 lemma cpm_inv_sort1: ∀n,h,G,L,T2,s. ⦃G, L⦄ ⊢ ⋆s ➡[n,h] T2 →
147 | T2 = ⋆(next h s) ∧ n = 1.
148 #n #h #G #L #T2 #s * #c #Hc #H elim (cpg_inv_sort1 … H) -H *
150 /4 width=1 by isrt_inv_01, isrt_inv_00, or_introl, or_intror, conj/
153 lemma cpm_inv_zero1: ∀n,h,G,L,T2. ⦃G, L⦄ ⊢ #0 ➡[n, h] T2 →
155 | ∃∃K,V1,V2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 & ⬆*[1] V2 ≘ T2 &
157 | ∃∃k,K,V1,V2. ⦃G, K⦄ ⊢ V1 ➡[k, h] V2 & ⬆*[1] V2 ≘ T2 &
159 #n #h #G #L #T2 * #c #Hc #H elim (cpg_inv_zero1 … H) -H *
160 [ #H1 #H2 destruct /4 width=1 by isrt_inv_00, or3_intro0, conj/
161 | #cV #K #V1 #V2 #HV12 #HVT2 #H1 #H2 destruct
162 /4 width=8 by or3_intro1, ex3_3_intro, ex2_intro/
163 | #cV #K #V1 #V2 #HV12 #HVT2 #H1 #H2 destruct
164 elim (isrt_inv_plus_SO_dx … Hc) -Hc // #k #Hc #H destruct
165 /4 width=8 by or3_intro2, ex4_4_intro, ex2_intro/
169 lemma cpm_inv_lref1: ∀n,h,G,L,T2,i. ⦃G, L⦄ ⊢ #↑i ➡[n, h] T2 →
170 ∨∨ T2 = #(↑i) ∧ n = 0
171 | ∃∃I,K,T. ⦃G, K⦄ ⊢ #i ➡[n, h] T & ⬆*[1] T ≘ T2 & L = K.ⓘ{I}.
172 #n #h #G #L #T2 #i * #c #Hc #H elim (cpg_inv_lref1 … H) -H *
173 [ #H1 #H2 destruct /4 width=1 by isrt_inv_00, or_introl, conj/
174 | #I #K #V2 #HV2 #HVT2 #H destruct
175 /4 width=6 by ex3_3_intro, ex2_intro, or_intror/
179 lemma cpm_inv_gref1: ∀n,h,G,L,T2,l. ⦃G, L⦄ ⊢ §l ➡[n, h] T2 → T2 = §l ∧ n = 0.
180 #n #h #G #L #T2 #l * #c #Hc #H elim (cpg_inv_gref1 … H) -H
181 #H1 #H2 destruct /3 width=1 by isrt_inv_00, conj/
184 (* Basic_2A1: includes: cpr_inv_bind1 *)
185 lemma cpm_inv_bind1: ∀n,h,p,I,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ➡[n, h] U2 →
186 ∨∨ ∃∃V2,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 & ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ➡[n, h] T2 &
188 | ∃∃T. ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[n, h] T & ⬆*[1] U2 ≘ T &
190 #n #h #p #I #G #L #V1 #T1 #U2 * #c #Hc #H elim (cpg_inv_bind1 … H) -H *
191 [ #cV #cT #V2 #T2 #HV12 #HT12 #H1 #H2 destruct
192 elim (isrt_inv_max … Hc) -Hc #nV #nT #HcV #HcT #H destruct
193 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
194 /4 width=5 by ex3_2_intro, ex2_intro, or_introl/
195 | #cT #T2 #HT12 #HUT2 #H1 #H2 #H3 destruct
196 /5 width=3 by isrt_inv_plus_O_dx, ex4_intro, ex2_intro, or_intror/
200 (* Basic_1: includes: pr0_gen_abbr pr2_gen_abbr *)
201 (* Basic_2A1: includes: cpr_inv_abbr1 *)
202 lemma cpm_inv_abbr1: ∀n,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓓ{p}V1.T1 ➡[n, h] U2 →
203 ∨∨ ∃∃V2,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 & ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[n, h] T2 &
205 | ∃∃T. ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[n, h] T & ⬆*[1] U2 ≘ T & p = true.
206 #n #h #p #G #L #V1 #T1 #U2 * #c #Hc #H elim (cpg_inv_abbr1 … H) -H *
207 [ #cV #cT #V2 #T2 #HV12 #HT12 #H1 #H2 destruct
208 elim (isrt_inv_max … Hc) -Hc #nV #nT #HcV #HcT #H destruct
209 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
210 /4 width=5 by ex3_2_intro, ex2_intro, or_introl/
211 | #cT #T2 #HT12 #HUT2 #H1 #H2 destruct
212 /5 width=3 by isrt_inv_plus_O_dx, ex3_intro, ex2_intro, or_intror/
216 (* Basic_1: includes: pr0_gen_abst pr2_gen_abst *)
217 (* Basic_2A1: includes: cpr_inv_abst1 *)
218 lemma cpm_inv_abst1: ∀n,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓛ{p}V1.T1 ➡[n, h] U2 →
219 ∃∃V2,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 & ⦃G, L.ⓛV1⦄ ⊢ T1 ➡[n, h] T2 &
221 #n #h #p #G #L #V1 #T1 #U2 * #c #Hc #H elim (cpg_inv_abst1 … H) -H
222 #cV #cT #V2 #T2 #HV12 #HT12 #H1 #H2 destruct
223 elim (isrt_inv_max … Hc) -Hc #nV #nT #HcV #HcT #H destruct
224 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
225 /3 width=5 by ex3_2_intro, ex2_intro/
228 (* Basic_1: includes: pr0_gen_appl pr2_gen_appl *)
229 (* Basic_2A1: includes: cpr_inv_appl1 *)
230 lemma cpm_inv_appl1: ∀n,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓐ V1.U1 ➡[n, h] U2 →
231 ∨∨ ∃∃V2,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 & ⦃G, L⦄ ⊢ U1 ➡[n, h] T2 &
233 | ∃∃p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 & ⦃G, L⦄ ⊢ W1 ➡[h] W2 &
234 ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[n, h] T2 &
235 U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2
236 | ∃∃p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V & ⬆*[1] V ≘ V2 &
237 ⦃G, L⦄ ⊢ W1 ➡[h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[n, h] T2 &
238 U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2.
239 #n #h #G #L #V1 #U1 #U2 * #c #Hc #H elim (cpg_inv_appl1 … H) -H *
240 [ #cV #cT #V2 #T2 #HV12 #HT12 #H1 #H2 destruct
241 elim (isrt_inv_max … Hc) -Hc #nV #nT #HcV #HcT #H destruct
242 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
243 /4 width=5 by or3_intro0, ex3_2_intro, ex2_intro/
244 | #cV #cW #cT #p #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #HT12 #H1 #H2 #H3 destruct
245 lapply (isrt_inv_plus_O_dx … Hc ?) -Hc // #Hc
246 elim (isrt_inv_max … Hc) -Hc #n0 #nT #Hc #HcT #H destruct
247 elim (isrt_inv_max … Hc) -Hc #nV #nW #HcV #HcW #H destruct
248 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
249 elim (isrt_inv_shift … HcW) -HcW #HcW #H destruct
250 /4 width=11 by or3_intro1, ex5_6_intro, ex2_intro/
251 | #cV #cW #cT #p #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 #HW12 #HT12 #H1 #H2 #H3 destruct
252 lapply (isrt_inv_plus_O_dx … Hc ?) -Hc // #Hc
253 elim (isrt_inv_max … Hc) -Hc #n0 #nT #Hc #HcT #H destruct
254 elim (isrt_inv_max … Hc) -Hc #nV #nW #HcV #HcW #H destruct
255 elim (isrt_inv_shift … HcV) -HcV #HcV #H destruct
256 elim (isrt_inv_shift … HcW) -HcW #HcW #H destruct
257 /4 width=13 by or3_intro2, ex6_7_intro, ex2_intro/
261 lemma cpm_inv_cast1: ∀n,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓝV1.U1 ➡[n, h] U2 →
262 ∨∨ ∃∃V2,T2. ⦃G, L⦄ ⊢ V1 ➡[n, h] V2 & ⦃G, L⦄ ⊢ U1 ➡[n, h] T2 &
264 | ⦃G, L⦄ ⊢ U1 ➡[n, h] U2
265 | ∃∃k. ⦃G, L⦄ ⊢ V1 ➡[k, h] U2 & n = ↑k.
266 #n #h #G #L #V1 #U1 #U2 * #c #Hc #H elim (cpg_inv_cast1 … H) -H *
267 [ #cV #cT #V2 #T2 #HV12 #HT12 #HcVT #H1 #H2 destruct
268 elim (isrt_inv_max … Hc) -Hc #nV #nT #HcV #HcT #H destruct
269 lapply (isrt_eq_t_trans … HcV HcVT) -HcVT #H
270 lapply (isrt_inj … H HcT) -H #H destruct <idempotent_max
271 /4 width=5 by or3_intro0, ex3_2_intro, ex2_intro/
272 | #cU #U12 #H destruct
273 /4 width=3 by isrt_inv_plus_O_dx, or3_intro1, ex2_intro/
274 | #cU #H12 #H destruct
275 elim (isrt_inv_plus_SO_dx … Hc) -Hc // #k #Hc #H destruct
276 /4 width=3 by or3_intro2, ex2_intro/
280 (* Basic forward lemmas *****************************************************)
282 (* Basic_2A1: includes: cpr_fwd_bind1_minus *)
283 lemma cpm_fwd_bind1_minus: ∀n,h,I,G,L,V1,T1,T. ⦃G, L⦄ ⊢ -ⓑ{I}V1.T1 ➡[n, h] T → ∀p.
284 ∃∃V2,T2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ➡[n, h] ⓑ{p,I}V2.T2 &
286 #n #h #I #G #L #V1 #T1 #T * #c #Hc #H #p elim (cpg_fwd_bind1_minus … H p) -H
287 /3 width=4 by ex2_2_intro, ex2_intro/
290 (* Basic eliminators ********************************************************)
292 lemma cpm_ind (h): ∀R:relation5 nat genv lenv term term.
293 (∀I,G,L. R 0 G L (⓪{I}) (⓪{I})) →
294 (∀G,L,s. R 1 G L (⋆s) (⋆(next h s))) →
295 (∀n,G,K,V1,V2,W2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 → R n G K V1 V2 →
296 ⬆*[1] V2 ≘ W2 → R n G (K.ⓓV1) (#0) W2
297 ) → (∀n,G,K,V1,V2,W2. ⦃G, K⦄ ⊢ V1 ➡[n, h] V2 → R n G K V1 V2 →
298 ⬆*[1] V2 ≘ W2 → R (↑n) G (K.ⓛV1) (#0) W2
299 ) → (∀n,I,G,K,T,U,i. ⦃G, K⦄ ⊢ #i ➡[n, h] T → R n G K (#i) T →
300 ⬆*[1] T ≘ U → R n G (K.ⓘ{I}) (#↑i) (U)
301 ) → (∀n,p,I,G,L,V1,V2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ➡[n, h] T2 →
302 R 0 G L V1 V2 → R n G (L.ⓑ{I}V1) T1 T2 → R n G L (ⓑ{p,I}V1.T1) (ⓑ{p,I}V2.T2)
303 ) → (∀n,G,L,V1,V2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 →
304 R 0 G L V1 V2 → R n G L T1 T2 → R n G L (ⓐV1.T1) (ⓐV2.T2)
305 ) → (∀n,G,L,V1,V2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[n, h] V2 → ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 →
306 R n G L V1 V2 → R n G L T1 T2 → R n G L (ⓝV1.T1) (ⓝV2.T2)
307 ) → (∀n,G,L,V,T1,T,T2. ⦃G, L.ⓓV⦄ ⊢ T1 ➡[n, h] T → R n G (L.ⓓV) T1 T →
308 ⬆*[1] T2 ≘ T → R n G L (+ⓓV.T1) T2
309 ) → (∀n,G,L,V,T1,T2. ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 →
310 R n G L T1 T2 → R n G L (ⓝV.T1) T2
311 ) → (∀n,G,L,V1,V2,T. ⦃G, L⦄ ⊢ V1 ➡[n, h] V2 →
312 R n G L V1 V2 → R (↑n) G L (ⓝV1.T) V2
313 ) → (∀n,p,G,L,V1,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 → ⦃G, L⦄ ⊢ W1 ➡[h] W2 → ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[n, h] T2 →
314 R 0 G L V1 V2 → R 0 G L W1 W2 → R n G (L.ⓛW1) T1 T2 →
315 R n G L (ⓐV1.ⓛ{p}W1.T1) (ⓓ{p}ⓝW2.V2.T2)
316 ) → (∀n,p,G,L,V1,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[h] V → ⦃G, L⦄ ⊢ W1 ➡[h] W2 → ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[n, h] T2 →
317 R 0 G L V1 V → R 0 G L W1 W2 → R n G (L.ⓓW1) T1 T2 →
318 ⬆*[1] V ≘ V2 → R n G L (ⓐV1.ⓓ{p}W1.T1) (ⓓ{p}W2.ⓐV2.T2)
320 ∀n,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡[n, h] T2 → R n G L T1 T2.
321 #h #R #IH1 #IH2 #IH3 #IH4 #IH5 #IH6 #IH7 #IH8 #IH9 #IH10 #IH11 #IH12 #IH13 #n #G #L #T1 #T2
322 * #c #HC #H generalize in match HC; -HC generalize in match n; -n
323 elim H -c -G -L -T1 -T2
324 [ #I #G #L #n #H <(isrt_inv_00 … H) -H //
325 | #G #L #s #n #H <(isrt_inv_01 … H) -H //
326 | /3 width=4 by ex2_intro/
327 | #c #G #L #V1 #V2 #W2 #HV12 #HVW2 #IH #x #H
328 elim (isrt_inv_plus_SO_dx … H) -H // #n #Hc #H destruct
329 /3 width=4 by ex2_intro/
330 | /3 width=4 by ex2_intro/
331 | #cV #cT #p #I #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #IHV #IHT #n #H
332 elim (isrt_inv_max_shift_sn … H) -H #HcV #HcT
333 /3 width=3 by ex2_intro/
334 | #cV #cT #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #IHV #IHT #n #H
335 elim (isrt_inv_max_shift_sn … H) -H #HcV #HcT
336 /3 width=3 by ex2_intro/
337 | #cU #cT #G #L #U1 #U2 #T1 #T2 #HUT #HU12 #HT12 #IHU #IHT #n #H
338 elim (isrt_inv_max_eq_t … H) -H // #HcV #HcT
339 /3 width=3 by ex2_intro/
340 | #c #G #L #V #T1 #T2 #T #HT12 #HT2 #IH #n #H
341 lapply (isrt_inv_plus_O_dx … H ?) -H // #Hc
342 /3 width=4 by ex2_intro/
343 | #c #G #L #U #T1 #T2 #HT12 #IH #n #H
344 lapply (isrt_inv_plus_O_dx … H ?) -H // #Hc
345 /3 width=3 by ex2_intro/
346 | #c #G #L #U1 #U2 #T #HU12 #IH #x #H
347 elim (isrt_inv_plus_SO_dx … H) -H // #n #Hc #H destruct
348 /3 width=3 by ex2_intro/
349 | #cV #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #HT12 #IHV #IHW #IHT #n #H
350 lapply (isrt_inv_plus_O_dx … H ?) -H // >max_shift #H
351 elim (isrt_inv_max_shift_sn … H) -H #H #HcT
352 elim (isrt_O_inv_max … H) -H #HcV #HcW
353 /3 width=3 by ex2_intro/
354 | #cV #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 #HW12 #HT12 #IHV #IHW #IHT #n #H
355 lapply (isrt_inv_plus_O_dx … H ?) -H // >max_shift #H
356 elim (isrt_inv_max_shift_sn … H) -H #H #HcT
357 elim (isrt_O_inv_max … H) -H #HcV #HcW
358 /3 width=4 by ex2_intro/