fvbi<

Theorem.

Arguments:

x (sv), phi (pr), psi (pr),

Hypotheses:

(x bound in phi)

Assertions:

(forallx(phileftrightarrowpsi)to(phileftrightarrowforallxpsi))

Proof:

Hyp Ref Line Expr
Hypo1(x bound in phi)
eqt-∀2(forallx(phileftrightarrowpsi)to(forallxphileftrightarrowforallxpsi))
1fv.eqal3(phileftrightarrowforallxphi)
2, 3rpb32>>4(forallx(phileftrightarrowpsi)to(phileftrightarrowforallxpsi))