mpi

Theorem. A nested modus ponens inference.

Arguments:

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

Hypotheses:

(phito(psitochi))
psi

Assertions:

(phitochi)

Proof:

Hyp Ref Line Expr
Hypo1(phito(psitochi))
2psi
1com12i3(psito(phitochi))
2, 3ax-mp4(phitochi)