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La négation de la proposition (A et B) ⟹ (C ou D) est :
(non(C) et non(D)) ⟹ (non(A) ou non(B))
(non(A) ou non(B)) ⟹ (non(C) et non(D))
non(C) et non(D) et A et B
(A et B) ou (C ou D)
(A et B) ⟹ (non(C) et non(D))
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