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Theorem pm1.2 499
Description: Axiom *1.2 of [WhiteheadRussell] p. 96, which they call "Taut". (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.2 ((φ φ) → φ)

Proof of Theorem pm1.2
StepHypRef Expression
1 id 19 . 2 (φφ)
21, 1jaoi 368 1 ((φ φ) → φ)
Colors of variables: wff setvar class
Syntax hints:  wi 4   wo 357
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-or 359
This theorem is referenced by:  oridm  500  rb-ax4  1520
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