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| Mirrors > Home > ILE Home > Th. List > mpjao3dan | GIF version | ||
| Description: Eliminate a 3-way disjunction in a deduction. (Contributed by Thierry Arnoux, 13-Apr-2018.) |
| Ref | Expression |
|---|---|
| mpjao3dan.1 | ⊢ ((𝜑 ∧ 𝜓) → 𝜒) |
| mpjao3dan.2 | ⊢ ((𝜑 ∧ 𝜃) → 𝜒) |
| mpjao3dan.3 | ⊢ ((𝜑 ∧ 𝜏) → 𝜒) |
| mpjao3dan.4 | ⊢ (𝜑 → (𝜓 ∨ 𝜃 ∨ 𝜏)) |
| Ref | Expression |
|---|---|
| mpjao3dan | ⊢ (𝜑 → 𝜒) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mpjao3dan.1 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜒) | |
| 2 | mpjao3dan.2 | . . 3 ⊢ ((𝜑 ∧ 𝜃) → 𝜒) | |
| 3 | 1, 2 | jaodan 805 | . 2 ⊢ ((𝜑 ∧ (𝜓 ∨ 𝜃)) → 𝜒) |
| 4 | mpjao3dan.3 | . 2 ⊢ ((𝜑 ∧ 𝜏) → 𝜒) | |
| 5 | mpjao3dan.4 | . . 3 ⊢ (𝜑 → (𝜓 ∨ 𝜃 ∨ 𝜏)) | |
| 6 | df-3or 1006 | . . 3 ⊢ ((𝜓 ∨ 𝜃 ∨ 𝜏) ↔ ((𝜓 ∨ 𝜃) ∨ 𝜏)) | |
| 7 | 5, 6 | sylib 122 | . 2 ⊢ (𝜑 → ((𝜓 ∨ 𝜃) ∨ 𝜏)) |
| 8 | 3, 4, 7 | mpjaodan 806 | 1 ⊢ (𝜑 → 𝜒) |
| 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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