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Theorem orri 860
Description: Infer disjunction from implication. (Contributed by NM, 11-Jun-1994.)
Hypothesis
Ref Expression
orri.1 𝜑𝜓)
Assertion
Ref Expression
orri (𝜑𝜓)

Proof of Theorem orri
StepHypRef Expression
1 orri.1 . 2 𝜑𝜓)
2 df-or 846 . 2 ((𝜑𝜓) ↔ (¬ 𝜑𝜓))
31, 2mpbir 230 1 (𝜑𝜓)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 845
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 206  df-or 846
This theorem is referenced by:  orci  863  olci  864  pm2.25  888  curryax  892  exmid  893  pm2.13  896  pm5.11g  942  pm5.12  944  pm5.14  945  pm5.55  947  pm3.12  992  pm5.15  1011  pm5.54  1016  4exmid  1050  rb-ax2  1755  rb-ax3  1756  rb-ax4  1757  exmo  2536  axi12  2701  exmidne  2950  ifeqor  4579  fvbr0  6920  letrii  11338  clwwlknondisj  29361  poimirlem26  36509  tsbi3  36998  tsan2  37005  tsan3  37006  clsk1indlem2  42783
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