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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.) Avoid ax-pow 5354. (Revised by BTernaryTau, 20-Nov-2024.) |
Ref | Expression |
---|---|
php2 | ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnfi 9164 | . . 3 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) | |
2 | pssss 4088 | . . 3 ⊢ (𝐵 ⊊ 𝐴 → 𝐵 ⊆ 𝐴) | |
3 | ssdomfi 9196 | . . . 4 ⊢ (𝐴 ∈ Fin → (𝐵 ⊆ 𝐴 → 𝐵 ≼ 𝐴)) | |
4 | 3 | imp 406 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊆ 𝐴) → 𝐵 ≼ 𝐴) |
5 | 1, 2, 4 | syl2an 595 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≼ 𝐴) |
6 | php 9207 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → ¬ 𝐴 ≈ 𝐵) | |
7 | ensymfib 9184 | . . . . . 6 ⊢ (𝐴 ∈ Fin → (𝐴 ≈ 𝐵 ↔ 𝐵 ≈ 𝐴)) | |
8 | 7 | biimprd 247 | . . . . 5 ⊢ (𝐴 ∈ Fin → (𝐵 ≈ 𝐴 → 𝐴 ≈ 𝐵)) |
9 | 1, 8 | syl 17 | . . . 4 ⊢ (𝐴 ∈ ω → (𝐵 ≈ 𝐴 → 𝐴 ≈ 𝐵)) |
10 | 9 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → (𝐵 ≈ 𝐴 → 𝐴 ≈ 𝐵)) |
11 | 6, 10 | mtod 197 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → ¬ 𝐵 ≈ 𝐴) |
12 | brsdom 8968 | . 2 ⊢ (𝐵 ≺ 𝐴 ↔ (𝐵 ≼ 𝐴 ∧ ¬ 𝐵 ≈ 𝐴)) | |
13 | 5, 11, 12 | sylanbrc 582 | 1 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → 𝐵 ≺ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∈ wcel 2098 ⊆ wss 3941 ⊊ wpss 3942 class class class wbr 5139 ωcom 7849 ≈ cen 8933 ≼ cdom 8934 ≺ csdm 8935 Fincfn 8936 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5290 ax-nul 5297 ax-pr 5418 ax-un 7719 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-ral 3054 df-rex 3063 df-reu 3369 df-rab 3425 df-v 3468 df-sbc 3771 df-csb 3887 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-pss 3960 df-nul 4316 df-if 4522 df-pw 4597 df-sn 4622 df-pr 4624 df-op 4628 df-uni 4901 df-br 5140 df-opab 5202 df-mpt 5223 df-tr 5257 df-id 5565 df-eprel 5571 df-po 5579 df-so 5580 df-fr 5622 df-we 5624 df-xp 5673 df-rel 5674 df-cnv 5675 df-co 5676 df-dm 5677 df-rn 5678 df-res 5679 df-ima 5680 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6486 df-fun 6536 df-fn 6537 df-f 6538 df-f1 6539 df-fo 6540 df-f1o 6541 df-fv 6542 df-om 7850 df-1o 8462 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 |
This theorem is referenced by: php3 9209 php4 9210 nndomog 9213 nndomogOLD 9223 |
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