Theorem pm3.21 262

Description: Join antecedents with conjunction. Theorem *3.21 of [WhiteheadRussell] p. 111. (Contributed by NM, 5-Aug-1993.)

Assertion

Ref	Expression
pm3.21	|- ( ph -> ( ps -> ( ps /\ ph ) ) )

Proof of Theorem pm3.21

Step	Hyp	Ref	Expression
1		pm3.2 138	. 2 |- ( ps -> ( ph -> ( ps /\ ph ) ) )
2	1	com12 30	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-ia3 107

This theorem is referenced by:  pm3.22  263  iba  298  ancr  319  anc2r  326  pm5.31  346  xoranor  1367  19.41h  1673  19.41  1674  ltsopr  7537  bj-findis  13861