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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 809 | . 2 ⊢ ((𝜑 ∧ (𝜓 ∨ 𝜃)) → 𝜒) |
| 4 | mpjao3dan.3 | . 2 ⊢ ((𝜑 ∧ 𝜏) → 𝜒) | |
| 5 | mpjao3dan.4 | . . 3 ⊢ (𝜑 → (𝜓 ∨ 𝜃 ∨ 𝜏)) | |
| 6 | df-3or 1010 | . . 3 ⊢ ((𝜓 ∨ 𝜃 ∨ 𝜏) ↔ ((𝜓 ∨ 𝜃) ∨ 𝜏)) | |
| 7 | 5, 6 | sylib 122 | . 2 ⊢ (𝜑 → ((𝜓 ∨ 𝜃) ∨ 𝜏)) |
| 8 | 3, 4, 7 | mpjaodan 810 | 1 ⊢ (𝜑 → 𝜒) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∨ wo 720 ∨ w3o 1008 |
| 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 721 |
| This theorem depends on definitions: df-bi 117 df-3or 1010 |
| This theorem is referenced by: wetriext 4722 nntri3 6764 nntri2or2 6765 nntr2 6770 tridc 7198 nnnninfeq 7462 exmidontriimlem2 7572 caucvgprlemnkj 8027 caucvgprlemnbj 8028 caucvgprprlemnkj 8053 caucvgprprlemnbj 8054 caucvgsr 8163 npnflt 10200 nmnfgt 10203 xleadd1a 10258 xltadd1 10261 xlt2add 10265 xsubge0 10266 xleaddadd 10272 addmodlteq 10818 iseqf1olemkle 10917 hashfiv01gt1 11204 iswrdiz 11294 xrmaxltsup 12007 xrmaxadd 12010 xrbdtri 12025 cvgratz 12282 zdvdsdc 12562 divalglemeunn 12671 divalglemex 12672 divalglemeuneg 12673 divalg 12674 znege1 12939 ennnfonelemk 13274 isxmet2d 15432 trilpolemres 17065 trirec0 17067 |
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