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Mirrors > Home > MPE Home > Th. List > ondomen | Structured version Visualization version GIF version |
Description: If a set is dominated by an ordinal, then it is numerable. (Contributed by Mario Carneiro, 5-Jan-2013.) |
Ref | Expression |
---|---|
ondomen | ⊢ ((𝐴 ∈ On ∧ 𝐵 ≼ 𝐴) → 𝐵 ∈ dom card) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | breq2 5152 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝐵 ≼ 𝑥 ↔ 𝐵 ≼ 𝐴)) | |
2 | 1 | rspcev 3622 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ≼ 𝐴) → ∃𝑥 ∈ On 𝐵 ≼ 𝑥) |
3 | ac10ct 10072 | . . 3 ⊢ (∃𝑥 ∈ On 𝐵 ≼ 𝑥 → ∃𝑟 𝑟 We 𝐵) | |
4 | 2, 3 | syl 17 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ≼ 𝐴) → ∃𝑟 𝑟 We 𝐵) |
5 | ween 10073 | . 2 ⊢ (𝐵 ∈ dom card ↔ ∃𝑟 𝑟 We 𝐵) | |
6 | 4, 5 | sylibr 234 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ≼ 𝐴) → 𝐵 ∈ dom card) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∃wex 1776 ∈ wcel 2106 ∃wrex 3068 class class class wbr 5148 We wwe 5640 dom cdm 5689 Oncon0 6386 ≼ cdom 8982 cardccrd 9973 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-se 5642 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-isom 6572 df-riota 7388 df-ov 7434 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-en 8985 df-dom 8986 df-card 9977 |
This theorem is referenced by: numdom 10076 alephnbtwn2 10110 alephsucdom 10117 fictb 10282 cfslb2n 10306 gchaleph2 10710 hargch 10711 inawinalem 10727 rankcf 10815 tskuni 10821 1stcrestlem 23476 2ndcctbss 23479 2ndcomap 23482 2ndcsep 23483 tx1stc 23674 tx2ndc 23675 met2ndci 24551 rn1st 45219 |
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