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Theorem pm5.61 1000
Description: Theorem *5.61 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 30-Jun-2013.)
Assertion
Ref Expression
pm5.61 (((𝜑𝜓) ∧ ¬ 𝜓) ↔ (𝜑 ∧ ¬ 𝜓))

Proof of Theorem pm5.61
StepHypRef Expression
1 orel2 890 . . 3 𝜓 → ((𝜑𝜓) → 𝜑))
2 orc 866 . . 3 (𝜑 → (𝜑𝜓))
31, 2impbid1 224 . 2 𝜓 → ((𝜑𝜓) ↔ 𝜑))
43pm5.32ri 577 1 (((𝜑𝜓) ∧ ¬ 𝜓) ↔ (𝜑 ∧ ¬ 𝜓))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 205  wa 397  wo 846
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-an 398  df-or 847
This theorem is referenced by:  ordtri3  6358  xrnemnf  13045  xrnepnf  13046  hashinfxadd  14292  tltnle  18318  limcdif  25256  ellimc2  25257  limcmpt  25263  limcres  25266  tglineeltr  27615  icorempo  35851  poimirlem14  36121  xrlttri5d  43591
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