Theorem com14

Description: Commutation of antecedents. Swap 1st and 4th. (Contributed by NM, 25-Apr-1994) (Proof shortened by Wolf Lammen, 28-Jul-2012)

	Ref	Expression
Hypothesis	com4.1	|- ( ph -> ( ps -> ( ch -> ( th -> ta ) ) ) )
Assertion	com14	|- ( th -> ( ps -> ( ch -> ( ph -> ta ) ) ) )

Proof

Step	Hyp	Ref	Expression
1		com4.1	|- ( ph -> ( ps -> ( ch -> ( th -> ta ) ) ) )
2	1	com4l	|- ( ps -> ( ch -> ( th -> ( ph -> ta ) ) ) )
3	2	com3r	|- ( th -> ( ps -> ( ch -> ( ph -> ta ) ) ) )