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

Proof of Theorem 3orrot
StepHypRef Expression
1 orcom 884 . 2 ((𝜑 ∨ (𝜓 ∨ 𝜒)) ↔ ((𝜓 ∨ 𝜒) ∨ 𝜑))
2 3orass 1106 . 2 ((𝜑 ∨ 𝜓 ∨ 𝜒) ↔ (𝜑 ∨ (𝜓 ∨ 𝜒)))
3 df-3or 1104 . 2 ((𝜓 ∨ 𝜒 ∨ 𝜑) ↔ ((𝜓 ∨ 𝜒) ∨ 𝜑))
41, 2, 33bitr4i 306 1 ((𝜑 ∨ 𝜓 ∨ 𝜒) ↔ (𝜓 ∨ 𝜒 ∨ 𝜑))
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  9537  ssxr  11372  elnnz  12696  elznn  12702  pfxnd0  14831  nolt02o  28045  nosupbnd2lem1  28065  colrot1  29015  lnrot1  29084  lnrot2  29085  dfon2lem5  36529  dfon2lem6  36530  colinearperm3  36808  wl-exeq  38446  dvasin  38602  frege129d  44748  usgrexmpl2nb0  49098  usgrexmpl2nb3  49101
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