Theorem biantrur 303

Description: A wff is equivalent to its conjunction with truth. (Contributed by NM, 3-Aug-1994.)

Hypothesis

Ref	Expression
biantrur.1	|- ph

Assertion

Ref	Expression
biantrur	|- ( ps <-> ( ph /\ ps ) )

Proof of Theorem biantrur

Step	Hyp	Ref	Expression
1		biantrur.1	. 2 |- ph
2		ibar 301	. 2 |- ( ph -> ( ps <-> ( ph /\ ps ) ) )
3	1, 2	ax-mp 5	1 |- ( ps <-> ( ph /\ ps ) )

This proof depends on syntax axioms:   /\ wa 104   <-> wb 105

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia2 107  ax-ia3 108

This proof depends on definitions:  df-bi 117

This theorem is used by:  mpbiran  953  truan  1419  rexv  2840  reuv  2841  rmov  2842  rabab  2843  euxfrdc  3012  euind  3013  dfdif3  3339  ddifstab  3361  vss  3568  mptv  4230  regexmidlem1  4682  peano5  4747  intirr  5177  fvopab6  5808  riotav  6047  mpov  6181  opabn1stprc  6433  brtpos0  6527  frec0g  6672  inl11  7412  apreim  8940  ccatlcan  11513  clim0  12077  gcd0id  12782  nnwosdc  12842  gzsum0  13773  isbasis3g  15284  opnssneib  15394  ssidcn  15448  bj-d0clsepcl  17168