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Theorem pm1.2 901
Description: Axiom *1.2 of [WhiteheadRussell] p. 96, which they call "Taut". (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.2 ((𝜑𝜑) → 𝜑)

Proof of Theorem pm1.2
StepHypRef Expression
1 id 22 . 2 (𝜑𝜑)
21, 1jaoi 854 1 ((𝜑𝜑) → 𝜑)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 844
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 210  df-or 845
This theorem is referenced by:  oridm  902  rb-ax4  1757  sotrieq  5470  swoer  8306  pthacycspth  32518  paddidm  37136
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