Mercurial > hg > Papers > 2020 > soto-midterm

comparison src/whileLoopPSem.agda @ 1:73127e0ab57c

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author soto@cr.ie.u-ryukyu.ac.jp
date Tue, 08 Sep 2020 18:38:08 +0900
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0:b919985837a3 1:73127e0ab57c
1 whileLoopPSem : {l : Level} {t : Set l} → (input : Envc ) → (vari input) + (varn input) ≡ (c10 input)
2 → (next : (output : Envc ) → ((vari input) + (varn input) ≡ (c10 input) ) implies ((vari output) + (varn output) ≡ (c10 output)) → t)
3 → (exit : (output : Envc ) → ((vari input) + (varn input) ≡ (c10 input) ) implies ((vari output ≡ c10 output)) → t) → t
4 whileLoopPSem env s next exit with varn env | s
5 ... | zero | _ = exit env (proof (λ z → z))
6 ... | (suc varn ) | refl = next ( record env { varn = varn ; vari = suc (vari env) } ) (proof λ x → +-suc varn (vari env) )
7
8
9 loopPPSem : (input output : Envc ) → output ≡ loopPP (varn input) input refl
10 → (vari input) + (varn input) ≡ (c10 input) → ((vari input) + (varn input) ≡ (c10 input) ) implies ((vari output ≡ c10 output))
11 loopPPSem input output refl s2p = loopPPSemInduct (varn input) input refl refl s2p
12 where
13 lem : (n : ℕ) → (env : Envc) → n + suc (vari env) ≡ suc (n + vari env)
14 lem n env = +-suc (n) (vari env)
15 loopPPSemInduct : (n : ℕ) → (current : Envc) → (eq : n ≡ varn current) → (loopeq : output ≡ loopPP n current eq)
16 → ((vari current) + (varn current) ≡ (c10 current) ) → ((vari current) + (varn current) ≡ (c10 current) ) implies ((vari output ≡ c10 output))
17 loopPPSemInduct zero current refl loopeq refl rewrite loopeq = proof (λ x → refl)
18 loopPPSemInduct (suc n) current refl loopeq refl rewrite (sym (lem n current)) =
19 whileLoopPSem current refl
20 (λ output x → loopPPSemInduct n (record { c10 = n + suc (vari current) ; varn = n ; vari = suc (vari current) }) refl loopeq refl)
21 (λ output x → loopPPSemInduct n (record { c10 = n + suc (vari current) ; varn = n ; vari = suc (vari current) }) refl loopeq refl)