bmpi>

Theorem.

Arguments:

phi (pr), psi (pr), chi (pr),

Hypotheses:

(phito(psileftrightarrowchi))
psi

Assertions:

(phitochi)

Proof:

Hyp Ref Line Expr
Hypo1(phito(psileftrightarrowchi))
2psi
1bi>3(phito(psitochi))
2, 3mpi4(phitochi)