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Theorem xorneg1 1311
Description:  \/_ is negated under negation of one argument. (Contributed by Mario Carneiro, 4-Sep-2016.)
Assertion
Ref Expression
xorneg1  \/_  \/_

Proof of Theorem xorneg1
StepHypRef Expression
1 df-xor 1305 . 2  \/_
2 nbbn 347 . . 3
32con2bii 322 . 2
4 xnor 1306 . 2  \/_
51, 3, 43bitr2i 264 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:  xorneg2  1312  xorneg  1313
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