alcom

Theorem.

Arguments:

x (sv), y (sv), phi (pr),

Assertions:

(forallxforallyphileftrightarrowforallyforallxphi)

Proof:

Hyp Ref Line Expr
ax71(forallxforallyphitoforallyforallxphi)
ax72(forallyforallxphitoforallxforallyphi)
1, 2>bii3(forallxforallyphileftrightarrowforallyforallxphi)