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Theorem pm1.2 745
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 ((𝜑𝜑) → 𝜑)

Proof of Theorem pm1.2
StepHypRef Expression
1 id 19 . 2 (𝜑𝜑)
21, 1jaoi 705 1 ((𝜑𝜑) → 𝜑)
Colors of variables: wff set class
Syntax hints:  wi 4  wo 697
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698
This theorem depends on definitions:  df-bi 116
This theorem is referenced by:  oridm  746  sbequi  1811  swoer  6450
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