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Theorem pm2.61 193
Description: Theorem *2.61 of [WhiteheadRussell] p. 107. Useful for eliminating an antecedent. (Contributed by NM, 4-Jan-1993.) (Proof shortened by Wolf Lammen, 22-Sep-2013.)
Assertion
Ref Expression
pm2.61 ((𝜑𝜓) → ((¬ 𝜑𝜓) → 𝜓))

Proof of Theorem pm2.61
StepHypRef Expression
1 pm2.6 192 . 2 ((¬ 𝜑𝜓) → ((𝜑𝜓) → 𝜓))
21com12 32 1 ((𝜑𝜓) → ((¬ 𝜑𝜓) → 𝜓))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  bnj1109  31957  jath  32855  isltrn2N  37136  ltrnid  37151  ltrneq  37165  onfrALT  40760  onfrALTVD  41102
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