Sémantique Axiomatique ou Logique de Hoare - Ensiie

Logical rules consG and ConsD
A condition P is said stronger than Q in the cases where P ⇒ Q.
Similarly Q is weaker than P.
P ⇒ P ′ {P ′ }i{Q}
{P}i{Q}
(consG)
It is safe to make a pre-condition more specific (stronger). This rule
allows for strengthening pre-conditions
An instance :
(x = 4) ⇒ (x > 2) {x > 2}x := x + 1{x > 3}
{x = 4}x := x + 1{x > 3}
(ENSIIE) Hoare 22 / 52