al.ex

Theorem.

Arguments:

x (sv), phi (pr),

Assertions:

(forallxphileftrightarrowlnotexistsxlnotphi)

Proof:

Hyp Ref Line Expr
bneg>1(phileftrightarrowlnotlnotphi)
1eqt-∀-i2(forallxphileftrightarrowforallxlnotlnotphi)
aln.ex3(forallxlnotlnotphileftrightarrowlnotexistsxlnotphi)
2, 3bitr4(forallxphileftrightarrowlnotexistsxlnotphi)