intro hif
case mpr
B : State → Prop
S₁ S₂ T₁ T₂ : Stmt
hS : S₁ ~ S₂
hT : T₁ ~ T₂
s t : State
⊢ (Stmt.ifThenElse B S₂ T₂, s) ⟹ t → (Stmt.ifThenElse B S₁ T₁, s) ⟹ t
case mpr
B : State → Prop
S₁ S₂ T₁ T₂ : Stmt
hS : S₁ ~ S₂
hT : T₁ ~ T₂
s t : State
hif : (Stmt.ifThenElse B S₂ T₂, s) ⟹ t
⊢ (Stmt.ifThenElse B S₁ T₁, s) ⟹ t