contrapose
case mp
α : Type u_1
inst✝³ : DecidableEq α
inst✝² : Inhabited α
L : DeductionParameter α
inst✝¹ : L.Normal
inst✝ : Inhabited (MCT L)
p : Formula α
⊢ CanonicalModel L ⊧ p → L ⊢! p
case mp
α : Type u_1
inst✝³ : DecidableEq α
inst✝² : Inhabited α
L : DeductionParameter α
inst✝¹ : L.Normal
inst✝ : Inhabited (MCT L)
p : Formula α
⊢ ¬L ⊢! p → ¬CanonicalModel L ⊧ p