michael/csci8980-f21
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

minor edits

Browse source
This commit is contained in:
Jeremy Siek 2019-05-09 08:40:32 +02:00
parent 5add203818
commit 89b647b09d
1 changed files with 7 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
extra/extra/Substitution.lagda
View file

@ -8,7 +8,6 @@ module extra.Substitution where
open import plfa.Untyped
using (Type; Context; _⊢_; ★; _∋_; ∅; _,_; Z; S_; `_; ƛ_; _·_; rename; subst;
ext; exts; _[_]; subst-zero)
renaming (_∎ to _[])
open import plfa.Denotational using (Rename)
open import plfa.Soundness using (Subst)
@ -35,7 +34,7 @@ rename-equal : ∀{Γ Δ}{ρ ρ' : Rename Γ Δ}{M : Γ ⊢ ★}
→ same-rename ρ ρ'
→ rename ρ M ≡ rename ρ' M
rename-equal {M = ` x} s = cong `_ s
rename-equal {ρ = ρ}{ρ' = ρ'}{M = ƛ N} s =
rename-equal {ρ = ρ} {ρ' = ρ'} {M = ƛ N} s =
cong ƛ_ (rename-equal {ρ = ext ρ}{ρ' = ext ρ'}{M = N} (same-rename-ext s))
rename-equal {M = L · M} s = cong₂ _·_ (rename-equal s) (rename-equal s)
\end{code}
@ -410,14 +409,15 @@ rename-subst-commute {Γ}{Δ}{N}{M}{ρ} =
subst (cons (subst (ren ρ) M)
(seq (seq (ren ρ) (ren S_)) (cons (subst (ren ρ) M) ids))) N
≡⟨ subst-equal{M = N} (λ{A}{x} → cons-congR{x = x}
(λ{x} → seq-assoc{σ = ren ρ}{τ = ren S_}{θ = (cons (subst (ren ρ) M) ids)}{x = x})) ⟩
(λ{x} → seq-assoc {σ = ren ρ} {τ = ren S_}
{θ = (cons (subst (ren ρ) M) ids)} {x = x})) ⟩
subst (cons (subst (ren ρ) M)
(seq (ren ρ) (seq (ren S_) (cons (subst (ren ρ) M) ids)))) N
≡⟨ (subst-equal{M = N}λ{A}{x} → cons-congR{x = x}
λ{x} → seq-congR{σ = ren ρ}
λ{x} → seq-congR {σ = ren ρ}
{τ = (seq (ren S_) (cons (subst (ren ρ) M) ids))}
{τ' = ids}{x = x}
λ{A}{x} → seq-inc-cons{M = (subst (ren ρ) M)}{σ = ids}{x = x} ) ⟩
{τ' = ids} {x = x}
λ{A}{x} → seq-inc-cons {M = (subst (ren ρ) M)} {σ = ids} {x = x} ) ⟩
subst (cons (subst (ren ρ) M) (seq (ren ρ) ids)) N
≡⟨ (subst-equal{M = N}λ{A}{x} → sym (seq-cons{x = x}) ) ⟩
subst (seq (cons M ids) (ren ρ)) N