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Theorem pm2.1 894
Description: Theorem *2.1 of [WhiteheadRussell] p. 101. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 23-Nov-2012.)
Assertion
Ref Expression
pm2.1 𝜑𝜑)

Proof of Theorem pm2.1
StepHypRef Expression
1 id 22 . 2 (𝜑𝜑)
21imori 851 1 𝜑𝜑)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  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:  lelttric  10740  hashbclem  13810  maducoeval2  21249  hiidge0  28885  xrlelttric  30506  nofv  33278  wl-orel12  34915  ifpdfor2  40166  en3lpVD  41548  fvmptrabdm  43846
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