Theorem pm5.74ri 246

Description: Distribution of implication over biconditional (reverse inference rule). (Contributed by NM, 1-Aug-1994.)

Hypothesis

Ref	Expression
pm5.74ri.1

Assertion

Ref	Expression
pm5.74ri

Proof of Theorem pm5.74ri

Step	Hyp	Ref	Expression
1		pm5.74ri.1	. 2
2		pm5.74 244	. 2
3	1, 2	mpbir 209	1

Syntax hints:  ->wi 4  <->wb 184

This theorem is referenced by:  bitrd  253  bibi2d  318  tbt  344  cbval2  2027  sbied  2151  sbco2d  2159  axgroth6  9227  isprm2  14225  ufileu  20420  bj-cbval2v  34302

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 185