Theorem biimpac 298

Description: Inference from a logical equivalence. (Contributed by NM, 3-May-1994.)

Hypothesis

Ref	Expression
biimpa.1	|- ( ph -> ( ps <-> ch ) )

Assertion

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

Proof of Theorem biimpac

Step	Hyp	Ref	Expression
1		biimpa.1	. . 3 |- ( ph -> ( ps <-> ch ) )
2	1	biimpcd 159	. 2 |- ( ps -> ( ph -> ch ) )
3	2	imp 124	1 |- ( ( ps /\ ph ) -> ch )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105

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

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  gencbvex2  2807  ordtri2or2exmidlem  4558  onsucelsucexmidlem  4561  ordsuc  4595  onsucuni2  4596  poltletr  5066  tz6.12-1  5581  nfunsn  5589  nnaordex  6581  th3qlem1  6691  ssfilem  6931  diffitest  6943  nqnq0pi  7498  distrlem1prl  7642  distrlem1pru  7643  eqle  8111  flodddiv4  12075  zabsle1  15115