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author ryokka
date Wed, 12 Feb 2020 17:55:00 +0900
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_⇒_ : Bool → Bool → Bool
false  ⇒  _ = true
true  ⇒  true = true
true  ⇒  false = false

Axiom : Cond -> PrimComm -> Cond -> Set
Axiom pre comm post = ∀ (env : Env) →  (pre env) ⇒ ( post (comm env)) ≡ true

Tautology : Cond -> Cond -> Set
Tautology pre post = ∀ (env : Env) →  (pre env)  ⇒ (post env) ≡ true