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Theorem dedlem0a 952
Description: Lemma for an alternate version of weak deduction theorem. (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 503 . 2
2 ax-1 6 . . 3
3 biimt 335 . . 3
42, 3syl 16 . 2
51, 4bitrd 253 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184  /\wa 369
This theorem is referenced by:  iftrue  3947
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  df-an 371
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