Theorem pm3.22 263

Description: Theorem *3.22 of [WhiteheadRussell] p. 111. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 13-Nov-2012.)

Assertion

Ref	Expression
pm3.22	|- ( ( ph /\ ps ) -> ( ps /\ ph ) )

Proof of Theorem pm3.22

Step	Hyp	Ref	Expression
1		pm3.21 262	. 2 |- ( ph -> ( ps -> ( ps /\ ph ) ) )
2	1	imp 123	1 |- ( ( ph /\ ps ) -> ( ps /\ ph ) )

Syntax hints:   -> wi 4   /\ wa 103

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107

This theorem is referenced by:  ancom  264  ancom2s  561  ancom1s  564  eupickb  2100  enq0sym  7394  bj-peano4  13990