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Theorem dff2 100
Description: Alternate definition of "false". (Contributed by NM, 10-Aug-1997.)
Assertion
Ref Expression
dff2 0 = (aa )

Proof of Theorem dff2
StepHypRef Expression
1 df-f 42 . 2 0 = 1
2 df-t 41 . . 3 1 = (aa )
32ax-r4 37 . 2 1 = (aa )
41, 3ax-r2 36 1 0 = (aa )
Colors of variables: term
Syntax hints:   = wb 1   wn 4  wo 6  1wt 8  0wf 9
This theorem was proved from axioms:  ax-r2 36  ax-r4 37
This theorem depends on definitions:  df-t 41  df-f 42
This theorem is referenced by:  dff  101  or0  102
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