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Theorem simp21 948
Description: Simplification of doubly triple conjunction. (Contributed by NM, 17-Nov-2011.)
Assertion
Ref Expression
simp21  |-  ( (
ph  /\  ( ps  /\ 
ch  /\  th )  /\  ta )  ->  ps )

Proof of Theorem simp21
StepHypRef Expression
1 simp1 915 . 2  |-  ( ( ps  /\  ch  /\  th )  ->  ps )
213ad2ant2 937 1  |-  ( (
ph  /\  ( ps  /\ 
ch  /\  th )  /\  ta )  ->  ps )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 896
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105
This theorem depends on definitions:  df-bi 114  df-3an 898
This theorem is referenced by:  simpl21  993  simpr21  1002  simp121  1047  simp221  1056  simp321  1065
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