exact h3
case h1
P U : Formula
Δ : Set Formula
h1_Δ : ∀ U' ∈ Δ, U'.IsPrime
h1_U : U.IsPrime
h2 : U ∉ Δ
V : VarBoolAssignment
h3 : IsDeduct (evalPrimeFfToNot V '' Δ ∪ {U}) P
⊢ IsDeduct (evalPrimeFfToNot V '' Δ ∪ {U}) P
no goals