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Theorem xchnxbi 308
Description: Replacement of a subexpression by an equivalent one. (Contributed by Wolf Lammen, 27-Sep-2014.)
Hypotheses
Ref Expression
xchnxbi.1
xchnxbi.2
Assertion
Ref Expression
xchnxbi

Proof of Theorem xchnxbi
StepHypRef Expression
1 xchnxbi.2 . . 3
21notbii 296 . 2
3 xchnxbi.1 . 2
42, 3bitr3i 251 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184
This theorem is referenced by:  xchnxbir  309  ioran  490  pm5.24  894  2mo  2373  2moOLD  2374  necon1bbii  2721  nabbi  2790  psslinpr  9430  isprm2lem  14224
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
  Copyright terms: Public domain W3C validator