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Theorem pm5.32 573
Description: Distribution of implication over biconditional. Theorem *5.32 of [WhiteheadRussell] p. 125. (Contributed by NM, 1-Aug-1994.)
Assertion
Ref Expression
pm5.32 ((𝜑 → (𝜓𝜒)) ↔ ((𝜑𝜓) ↔ (𝜑𝜒)))

Proof of Theorem pm5.32
StepHypRef Expression
1 notbi 318 . . . 4 ((𝜓𝜒) ↔ (¬ 𝜓 ↔ ¬ 𝜒))
21imbi2i 335 . . 3 ((𝜑 → (𝜓𝜒)) ↔ (𝜑 → (¬ 𝜓 ↔ ¬ 𝜒)))
3 pm5.74 269 . . 3 ((𝜑 → (¬ 𝜓 ↔ ¬ 𝜒)) ↔ ((𝜑 → ¬ 𝜓) ↔ (𝜑 → ¬ 𝜒)))
4 notbi 318 . . 3 (((𝜑 → ¬ 𝜓) ↔ (𝜑 → ¬ 𝜒)) ↔ (¬ (𝜑 → ¬ 𝜓) ↔ ¬ (𝜑 → ¬ 𝜒)))
52, 3, 43bitri 296 . 2 ((𝜑 → (𝜓𝜒)) ↔ (¬ (𝜑 → ¬ 𝜓) ↔ ¬ (𝜑 → ¬ 𝜒)))
6 df-an 396 . . 3 ((𝜑𝜓) ↔ ¬ (𝜑 → ¬ 𝜓))
7 df-an 396 . . 3 ((𝜑𝜒) ↔ ¬ (𝜑 → ¬ 𝜒))
86, 7bibi12i 339 . 2 (((𝜑𝜓) ↔ (𝜑𝜒)) ↔ (¬ (𝜑 → ¬ 𝜓) ↔ ¬ (𝜑 → ¬ 𝜒)))
95, 8bitr4i 277 1 ((𝜑 → (𝜓𝜒)) ↔ ((𝜑𝜓) ↔ (𝜑𝜒)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 395
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 396
This theorem is referenced by:  pm5.32i  574  pm5.32d  576  biadan  815  biadaniALT  817  xordi  1013  rabbi  3314  cbvrexdva2  3390  rabxfrd  5343  asymref  6018  mpo2eqb  7397  cfilucfil4  24466  bj-rcleqf  35194  wl-ax11-lem8  35722  relexp0eq  41262  2sb5nd  42133  2sb5ndVD  42483  2sb5ndALT  42505  pm5.32dra  46092
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