Theorem an12s 555

Description: Swap two conjuncts in antecedent. The label suffix "s" means that an12 551 is combined with syl 14 (or a variant). (Contributed by NM, 13-Mar-1996.)

Hypothesis

Ref	Expression
an12s.1	|- ( ( ph /\ ( ps /\ ch ) ) -> th )

Assertion

Ref	Expression
an12s	|- ( ( ps /\ ( ph /\ ch ) ) -> th )

Proof of Theorem an12s

Step	Hyp	Ref	Expression
1		an12 551	. 2 |- ( ( ps /\ ( ph /\ ch ) ) <-> ( ph /\ ( ps /\ ch ) ) )
2		an12s.1	. 2 |- ( ( ph /\ ( ps /\ ch ) ) -> th )
3	1, 2	sylbi 120	1 |- ( ( ps /\ ( ph /\ ch ) ) -> th )

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 depends on definitions:  df-bi 116

This theorem is referenced by:  anabsan2  574  1stconst  6189  2ndconst  6190  sbthlemi5  6926  iccshftr  9930  iccshftl  9932  iccdil  9934  icccntr  9936  zfz1iso  10754  ndvdsadd  11868  neipsm  12794