imgen<i

Theorem.

Arguments:

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

Hypotheses:

(phitopsi)
(x bound in psi)

Assertions:

(existsxphitopsi)

Proof:

Hyp Ref Line Expr
Hypo1(phitopsi)
2(x bound in psi)
1im.bldex3(existsxphitoexistsxpsi)
2fv.eqex4(psileftrightarrowexistsxpsi)
3, 4brpi22<5(existsxphitopsi)