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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 802 | . 2 ⊢ ((𝜑 ∧ (𝜓 ∨ 𝜃)) → 𝜒) |
| 4 | mpjao3dan.3 | . 2 ⊢ ((𝜑 ∧ 𝜏) → 𝜒) | |
| 5 | mpjao3dan.4 | . . 3 ⊢ (𝜑 → (𝜓 ∨ 𝜃 ∨ 𝜏)) | |
| 6 | df-3or 1003 | . . 3 ⊢ ((𝜓 ∨ 𝜃 ∨ 𝜏) ↔ ((𝜓 ∨ 𝜃) ∨ 𝜏)) | |
| 7 | 5, 6 | sylib 122 | . 2 ⊢ (𝜑 → ((𝜓 ∨ 𝜃) ∨ 𝜏)) |
| 8 | 3, 4, 7 | mpjaodan 803 | 1 ⊢ (𝜑 → 𝜒) |
| 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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