subst h2
F F' : Formula
Δ_U : Set Formula
V : VarBoolAssignment
Δ_U' : Set Formula
h1 : ↑F.primeSet ⊆ Δ_U
h2 : Δ_U' = evalPrimeFfToNot V '' Δ_U
h3 : F' = evalPrimeFfToNot V F
⊢ IsDeduct Δ_U' F'
F F' : Formula
Δ_U : Set Formula
V : VarBoolAssignment
h1 : ↑F.primeSet ⊆ Δ_U
h3 : F' = evalPrimeFfToNot V F
⊢ IsDeduct (evalPrimeFfToNot V '' Δ_U) F'