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Theorem pm3.21 435
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
StepHypRef Expression
1 pm3.2 434 . 2  |-  ( ps 
->  ( ph  ->  ( ps  /\  ph ) ) )
21com12 27 1  |-  ( ph  ->  ( ps  ->  ( ps  /\  ph ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358
This theorem is referenced by:  pm3.22  436  iba  489  ancr  532  anc2r  539  pm5.31  571  19.41  1815  2mo  2221  smoord  6382  fisupg  7105  winalim2  8318  aalioulem5  19716  musum  20431  chrelat2i  22945  relin01  24089  waj-ax  24853  sssu  25141  pm11.71  27596  onfrALTlem2  28311  19.41rg  28316  onfrALTlem2VD  28665  2pm13.193VD  28679  a9e2eqVD  28683  bnj1173  29032  hlrelat2  29592
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-an 360
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