apply IsDeduct.mp_ P
P Q : Formula
Γ : Set Formula
h1 : IsProof P
h2 : IsDeduct Γ (P.imp_ Q)
⊢ IsDeduct Γ Q
case a
P Q : Formula
Γ : Set Formula
h1 : IsProof P
h2 : IsDeduct Γ (P.imp_ Q)
⊢ IsDeduct Γ (P.imp_ Q)

case a
P Q : Formula
Γ : Set Formula
h1 : IsProof P
h2 : IsDeduct Γ (P.imp_ Q)
⊢ IsDeduct Γ P