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Theorem rb-bijust 1582
Description: Justification for rb-imdf 1583. (Contributed by Anthony Hart, 17-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
rb-bijust

Proof of Theorem rb-bijust
StepHypRef Expression
1 dfbi1 192 . 2
2 imor 412 . . . 4
3 imor 412 . . . . 5
43notbii 296 . . . 4
52, 4imbi12i 326 . . 3
65notbii 296 . 2
7 pm4.62 419 . . 3
87notbii 296 . 2
91, 6, 83bitri 271 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  \/wo 368
This theorem is referenced by:  rb-imdf  1583
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  df-or 370
  Copyright terms: Public domain W3C validator