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Theorem xnor 1306
Description: Two ways to write XNOR. (Contributed by Mario Carneiro, 4-Sep-2016.)
Assertion
Ref Expression
xnor  \/_

Proof of Theorem xnor
StepHypRef Expression
1 df-xor 1305 . 2  \/_
21con2bii 322 1  \/_
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176    \/_ wxo 1304
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 177  df-xor 1305
This theorem is referenced by:  xorneg1  1311  hadbi  1387
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