Local Open Scope logic_base.
Local Open Scope syntax.
Module Semantics.
Definition andp {model: Type} (X: Ensemble model) (Y: Ensemble model): Ensemble model :=
fun m => X m /\ Y m.
Definition orp {model: Type} (X: Ensemble model) (Y: Ensemble model): Ensemble model :=
fun m => X m \/ Y m.
Definition falsep {model: Type}: Ensemble model := fun m => False.
End Semantics.
Class TrivialPropositionalSemantics (L: Language) {minL: MinimunLanguage L} {pL: PropositionalLanguage L} (MD: Model) (SM: Semantics L MD): Type := {
denote_andp: forall x y, Same_set _ (denotation (x && y)) (Semantics.andp (denotation x) (denotation y));
denote_orp: forall x y, Same_set _ (denotation (x || y)) (Semantics.orp (denotation x) (denotation y));
denote_falsep: Same_set _ (denotation FF) Semantics.falsep
}.
Section Trivial.
Context {L: Language}
{minL: MinimunLanguage L}
{pL: PropositionalLanguage L}
{MD: Model}
{SM: Semantics L MD}
{tpSM: TrivialPropositionalSemantics L MD SM}.

Lemma sat_andp: forall m x y, m |= x && y <-> (m |= x /\ m |= y).