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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  eueq3  3672  tprot  4712  wemapsolem  9581  ssxr  11418  elnnz  12743  elznn  12749  pfxnd0  14880  nolt02o  28109  nosupbnd2lem1  28129  colrot1  29079  lnrot1  29148  lnrot2  29149  dfon2lem5  36764  dfon2lem6  36765  colinearperm3  37043  wl-exeq  38734  dvasin  38890  frege129d  45024  usgrexmpl2nb0  49402  usgrexmpl2nb3  49405
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