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Theorem 3orrot 1108
Description: Rotation law for triple disjunction. (Contributed by NM, 4-Apr-1995.)
Assertion
Ref Expression
3orrot ((𝜑𝜓𝜒) ↔ (𝜓𝜒𝜑))

Proof of Theorem 3orrot
StepHypRef Expression
1 orcom 884 . 2 ((𝜑 ∨ (𝜓𝜒)) ↔ ((𝜓𝜒) ∨ 𝜑))
2 3orass 1106 . 2 ((𝜑𝜓𝜒) ↔ (𝜑 ∨ (𝜓𝜒)))
3 df-3or 1104 . 2 ((𝜓𝜒𝜑) ↔ ((𝜓𝜒) ∨ 𝜑))
41, 2, 33bitr4i 306 1 ((𝜑𝜓𝜒) ↔ (𝜓𝜒𝜑))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wo 861  w3o 1102
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This proof depends on definitions:  df-bi 210  df-or 862  df-3or 1104
This theorem is used by:  3orcomb  1110  3mix2  1350  3mix3  1351  3orel2OLD  1516  eueq3  3669  tprot  4710  wemapsolem  9522  ssxr  11303  elnnz  12625  elznn  12631  pfxnd0  14758  nolt02o  27931  nosupbnd2lem1  27951  colrot1  28901  lnrot1  28970  lnrot2  28971  dfon2lem5  36364  dfon2lem6  36365  colinearperm3  36643  wl-exeq  38297  dvasin  38453  frege129d  44603  usgrexmpl2nb0  48947  usgrexmpl2nb3  48950
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