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Theorem rp-fakeanorass 36877
 Description: A special case where a mixture of and and or appears to conform to a mixed associative law. (Contributed by Richard Penner, 26-Feb-2020.)
Assertion
Ref Expression
rp-fakeanorass ((𝜒𝜑) ↔ (((𝜑𝜓) ∨ 𝜒) ↔ (𝜑 ∧ (𝜓𝜒))))

Proof of Theorem rp-fakeanorass
StepHypRef Expression
1 pm1.4 400 . . . . . . . 8 ((𝜑𝜒) → (𝜒𝜑))
21ord 391 . . . . . . 7 ((𝜑𝜒) → (¬ 𝜒𝜑))
3 pm4.83 966 . . . . . . . 8 (((𝜒𝜑) ∧ (¬ 𝜒𝜑)) ↔ 𝜑)
43biimpi 205 . . . . . . 7 (((𝜒𝜑) ∧ (¬ 𝜒𝜑)) → 𝜑)
52, 4sylan2 490 . . . . . 6 (((𝜒𝜑) ∧ (𝜑𝜒)) → 𝜑)
65ex 449 . . . . 5 ((𝜒𝜑) → ((𝜑𝜒) → 𝜑))
76anim1d 586 . . . 4 ((𝜒𝜑) → (((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))))
8 orc 399 . . . . 5 (𝜑 → (𝜑𝜒))
98anim1i 590 . . . 4 ((𝜑 ∧ (𝜓𝜒)) → ((𝜑𝜒) ∧ (𝜓𝜒)))
107, 9jctir 559 . . 3 ((𝜒𝜑) → ((((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))) ∧ ((𝜑 ∧ (𝜓𝜒)) → ((𝜑𝜒) ∧ (𝜓𝜒)))))
11 olc 398 . . . . . 6 (𝜒 → (𝜑𝜒))
12 olc 398 . . . . . 6 (𝜒 → (𝜓𝜒))
1311, 12jca 553 . . . . 5 (𝜒 → ((𝜑𝜒) ∧ (𝜓𝜒)))
14 simpl 472 . . . . 5 ((𝜑 ∧ (𝜓𝜒)) → 𝜑)
1513, 14imim12i 60 . . . 4 ((((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))) → (𝜒𝜑))
1615adantr 480 . . 3 (((((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))) ∧ ((𝜑 ∧ (𝜓𝜒)) → ((𝜑𝜒) ∧ (𝜓𝜒)))) → (𝜒𝜑))
1710, 16impbii 198 . 2 ((𝜒𝜑) ↔ ((((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))) ∧ ((𝜑 ∧ (𝜓𝜒)) → ((𝜑𝜒) ∧ (𝜓𝜒)))))
18 dfbi2 658 . 2 ((((𝜑𝜒) ∧ (𝜓𝜒)) ↔ (𝜑 ∧ (𝜓𝜒))) ↔ ((((𝜑𝜒) ∧ (𝜓𝜒)) → (𝜑 ∧ (𝜓𝜒))) ∧ ((𝜑 ∧ (𝜓𝜒)) → ((𝜑𝜒) ∧ (𝜓𝜒)))))
19 ordir 905 . . . 4 (((𝜑𝜓) ∨ 𝜒) ↔ ((𝜑𝜒) ∧ (𝜓𝜒)))
2019bicomi 213 . . 3 (((𝜑𝜒) ∧ (𝜓𝜒)) ↔ ((𝜑𝜓) ∨ 𝜒))
2120bibi1i 327 . 2 ((((𝜑𝜒) ∧ (𝜓𝜒)) ↔ (𝜑 ∧ (𝜓𝜒))) ↔ (((𝜑𝜓) ∨ 𝜒) ↔ (𝜑 ∧ (𝜓𝜒))))
2217, 18, 213bitr2i 287 1 ((𝜒𝜑) ↔ (((𝜑𝜓) ∨ 𝜒) ↔ (𝜑 ∧ (𝜓𝜒))))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∨ wo 382   ∧ wa 383 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 196  df-or 384  df-an 385 This theorem is referenced by:  rp-fakeoranass  36878  rp-fakeinunass  36880
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