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Theorem pm1.2 660
Description: Axiom *1.2 (Taut) of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.) (Revised by NM, 10-Mar-2013.)
Assertion
Ref Expression
pm1.2 ((φ φ) → φ)

Proof of Theorem pm1.2
StepHypRef Expression
1 id 19 . 2 (φφ)
21, 1jaoi 623 1 ((φ φ) → φ)
Colors of variables: wff set class
Syntax hints:  wi 4   wo 616
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 617
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  oridm  661  sbequi  1698  swoer  6041
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