Local Open Scope logic_base.
Local Open Scope syntax.
Section Sound.
Context {L: Language}
{minL: MinimunLanguage L}
{pL: PropositionalLanguage L}
{MD: Model}
{SM: Semantics L MD}
{tminSM: TrivialMinimunSemantics L MD SM}
{tpSM: TrivialPropositionalSemantics L MD SM}.

Lemma sound_andp_intros:
forall x y m,
m |= x --> y --> x && y.