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Theorem mpjao3dan 1341
Description: Eliminate a 3-way disjunction in a deduction. (Contributed by Thierry Arnoux, 13-Apr-2018.)
Hypotheses
Ref Expression
mpjao3dan.1 ((𝜑𝜓) → 𝜒)
mpjao3dan.2 ((𝜑𝜃) → 𝜒)
mpjao3dan.3 ((𝜑𝜏) → 𝜒)
mpjao3dan.4 (𝜑 → (𝜓𝜃𝜏))
Assertion
Ref Expression
mpjao3dan (𝜑𝜒)

Proof of Theorem mpjao3dan
StepHypRef Expression
1 mpjao3dan.1 . . 3 ((𝜑𝜓) → 𝜒)
2 mpjao3dan.2 . . 3 ((𝜑𝜃) → 𝜒)
31, 2jaodan 802 . 2 ((𝜑 ∧ (𝜓𝜃)) → 𝜒)
4 mpjao3dan.3 . 2 ((𝜑𝜏) → 𝜒)
5 mpjao3dan.4 . . 3 (𝜑 → (𝜓𝜃𝜏))
6 df-3or 1003 . . 3 ((𝜓𝜃𝜏) ↔ ((𝜓𝜃) ∨ 𝜏))
75, 6sylib 122 . 2 (𝜑 → ((𝜓𝜃) ∨ 𝜏))
83, 4, 7mpjaodan 803 1 (𝜑𝜒)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wo 713  w3o 1001
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714
This theorem depends on definitions:  df-bi 117  df-3or 1003
This theorem is referenced by:  wetriext  4670  nntri3  6656  nntri2or2  6657  nntr2  6662  tridc  7075  nnnninfeq  7311  exmidontriimlem2  7420  caucvgprlemnkj  7869  caucvgprlemnbj  7870  caucvgprprlemnkj  7895  caucvgprprlemnbj  7896  caucvgsr  8005  npnflt  10028  nmnfgt  10031  xleadd1a  10086  xltadd1  10089  xlt2add  10093  xsubge0  10094  xleaddadd  10100  addmodlteq  10637  iseqf1olemkle  10736  hashfiv01gt1  11021  iswrdiz  11096  xrmaxltsup  11790  xrmaxadd  11793  xrbdtri  11808  cvgratz  12064  zdvdsdc  12344  divalglemeunn  12453  divalglemex  12454  divalglemeuneg  12455  divalg  12456  znege1  12721  ennnfonelemk  12992  isxmet2d  15043  trilpolemres  16524  trirec0  16526
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