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Theorem pm1.2 513
Description: Axiom *1.2 of [WhiteheadRussell] p. 96, which they call "Taut". (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.2

Proof of Theorem pm1.2
StepHypRef Expression
1 id 22 . 2
21, 1jaoi 379 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  \/wo 368
This theorem is referenced by:  oridm  514  rb-ax4  1588  sotrieq  4832  swoer  7358  paddidm  35565
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-or 370
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