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Mirrors > Home > MPE Home > Th. List > php2 | Structured version Visualization version GIF version |
Description: Corollary of Pigeonhole Principle. (Contributed by NM, 31-May-1998.) |
Ref | Expression |
---|---|
php2 | ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2877 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ ω ↔ 𝐴 ∈ ω)) | |
2 | psseq2 4016 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝐵 ⊊ 𝑥 ↔ 𝐵 ⊊ 𝐴)) | |
3 | 1, 2 | anbi12d 633 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) ↔ (𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴))) |
4 | breq2 5034 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝐵 ≺ 𝑥 ↔ 𝐵 ≺ 𝐴)) | |
5 | 3, 4 | imbi12d 348 | . . 3 ⊢ (𝑥 = 𝐴 → (((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) → 𝐵 ≺ 𝑥) ↔ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴))) |
6 | vex 3444 | . . . . . 6 ⊢ 𝑥 ∈ V | |
7 | pssss 4023 | . . . . . 6 ⊢ (𝐵 ⊊ 𝑥 → 𝐵 ⊆ 𝑥) | |
8 | ssdomg 8538 | . . . . . 6 ⊢ (𝑥 ∈ V → (𝐵 ⊆ 𝑥 → 𝐵 ≼ 𝑥)) | |
9 | 6, 7, 8 | mpsyl 68 | . . . . 5 ⊢ (𝐵 ⊊ 𝑥 → 𝐵 ≼ 𝑥) |
10 | 9 | adantl 485 | . . . 4 ⊢ ((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) → 𝐵 ≼ 𝑥) |
11 | php 8685 | . . . . 5 ⊢ ((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) → ¬ 𝑥 ≈ 𝐵) | |
12 | ensym 8541 | . . . . 5 ⊢ (𝐵 ≈ 𝑥 → 𝑥 ≈ 𝐵) | |
13 | 11, 12 | nsyl 142 | . . . 4 ⊢ ((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) → ¬ 𝐵 ≈ 𝑥) |
14 | brsdom 8515 | . . . 4 ⊢ (𝐵 ≺ 𝑥 ↔ (𝐵 ≼ 𝑥 ∧ ¬ 𝐵 ≈ 𝑥)) | |
15 | 10, 13, 14 | sylanbrc 586 | . . 3 ⊢ ((𝑥 ∈ ω ∧ 𝐵 ⊊ 𝑥) → 𝐵 ≺ 𝑥) |
16 | 5, 15 | vtoclg 3515 | . 2 ⊢ (𝐴 ∈ ω → ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴)) |
17 | 16 | anabsi5 668 | 1 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 = wceq 1538 ∈ wcel 2111 Vcvv 3441 ⊆ wss 3881 ⊊ wpss 3882 class class class wbr 5030 ωcom 7560 ≈ cen 8489 ≼ cdom 8490 ≺ csdm 8491 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-om 7561 df-er 8272 df-en 8493 df-dom 8494 df-sdom 8495 |
This theorem is referenced by: php4 8688 nndomog 8692 |
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