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Theorem mpjao3dan 1344
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 805 . 2 ((𝜑 ∧ (𝜓𝜃)) → 𝜒)
4 mpjao3dan.3 . 2 ((𝜑𝜏) → 𝜒)
5 mpjao3dan.4 . . 3 (𝜑 → (𝜓𝜃𝜏))
6 df-3or 1006 . . 3 ((𝜓𝜃𝜏) ↔ ((𝜓𝜃) ∨ 𝜏))
75, 6sylib 122 . 2 (𝜑 → ((𝜓𝜃) ∨ 𝜏))
83, 4, 7mpjaodan 806 1 (𝜑𝜒)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wo 716  w3o 1004
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 717
This theorem depends on definitions:  df-bi 117  df-3or 1006
This theorem is referenced by:  wetriext  4704  nntri3  6743  nntri2or2  6744  nntr2  6749  tridc  7170  nnnninfeq  7432  exmidontriimlem2  7542  caucvgprlemnkj  7997  caucvgprlemnbj  7998  caucvgprprlemnkj  8023  caucvgprprlemnbj  8024  caucvgsr  8133  npnflt  10167  nmnfgt  10170  xleadd1a  10225  xltadd1  10228  xlt2add  10232  xsubge0  10233  xleaddadd  10239  addmodlteq  10784  iseqf1olemkle  10883  hashfiv01gt1  11170  iswrdiz  11256  xrmaxltsup  11968  xrmaxadd  11971  xrbdtri  11986  cvgratz  12243  zdvdsdc  12523  divalglemeunn  12632  divalglemex  12633  divalglemeuneg  12634  divalg  12635  znege1  12900  ennnfonelemk  13235  isxmet2d  15325  trilpolemres  16938  trirec0  16940
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