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  2849  ordtri2or2exmidlem  4622  onsucelsucexmidlem  4625  ordsuc  4659  onsucuni2  4660  poltletr  5135  tz6.12-1  5662  nfunsn  5672  nnaordex  6691  th3qlem1  6801  ssfilem  7057  diffitest  7069  nqnq0pi  7648  distrlem1prl  7792  distrlem1pru  7793  eqle  8261  swrd0g  11231  flodddiv4  12487  zabsle1  15718