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Theorem dedlem0a 874
Description: Alternate version of dedlema 875. (Contributed by NM, 2-Apr-1994.) (Proof shortened by Andrew Salmon, 7-May-2011.) (Proof shortened by Wolf Lammen, 4-Dec-2012.)
Assertion
Ref Expression
dedlem0a

Proof of Theorem dedlem0a
StepHypRef Expression
1 iba 284 . 2
2 ax-1 5 . . 3
3 biimt 230 . . 3
42, 3syl 14 . 2
51, 4bitrd 177 1
Colors of variables: wff set class
Syntax hints:   wi 4   wa 97   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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