-lemma cpg_inv_bind1: ∀Rt,c,h,p,I,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ⬈[Rt, c, h] U2 → (
- ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
- U2 = ⓑ{p,I}V2.T2 & c = ((↓cV)∨cT)
- ) ∨
- ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ T1 ⬈[Rt, cT, h] T & ⬆*[1] U2 ≡ T &
- p = true & I = Abbr & c = cT+𝟙𝟘.
+lemma cpg_inv_bind1: ∀Rt,c,h,p,I,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ⬈[Rt, c, h] U2 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓑ{p,I}V2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cT,T. ⬆*[1] T ≘ T1 & ⦃G, L⦄ ⊢ T ⬈[Rt, cT, h] U2 &
+ p = true & I = Abbr & c = cT+𝟙𝟘.