spec-w

Theorem.

Arguments:

a (st), x (sv), phi (pr),

Distinct variable conditions:

(x, a),

Assertions:

(forallxphito[a/x]phi)

Proof:

Hyp Ref Line Expr
ax11(phito((xeqa)tophi))
1im.bldal2(forallxphitoforallx((xeqa)tophi))
dfsb-dval3(forallx((xeqa)tophi)to[a/x]phi)
2, 3syl4(forallxphito[a/x]phi)