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| Mirrors > Home > MPE Home > Th. List > fodomnum | Structured version Visualization version GIF version | ||
| Description: A version of fodom 10640 that doesn't require the Axiom of Choice ax-ac 10576. (Contributed by Mario Carneiro, 28-Feb-2013.) (Revised by Mario Carneiro, 28-Apr-2015.) |
| Ref | Expression |
|---|---|
| fodomnum | ⊢ (𝐴 ∈ dom card → (𝐹:𝐴⟶onto𝐵 → 𝐵 ≼ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | focdmex 8002 | . . . . 5 ⊢ (𝐴 ∈ dom card → (𝐹:𝐴⟶onto𝐵 → 𝐵 ∈ V)) | |
| 2 | 1 | com12 33 | . . . 4 ⊢ (𝐹:𝐴⟶onto𝐵 → (𝐴 ∈ dom card → 𝐵 ∈ V)) |
| 3 | numacn 10167 | . . . 4 ⊢ (𝐵 ∈ V → (𝐴 ∈ dom card → 𝐴 ∈ AC 𝐵)) | |
| 4 | 2, 3 | syli 40 | . . 3 ⊢ (𝐹:𝐴⟶onto𝐵 → (𝐴 ∈ dom card → 𝐴 ∈ AC 𝐵)) |
| 5 | 4 | com12 33 | . 2 ⊢ (𝐴 ∈ dom card → (𝐹:𝐴⟶onto𝐵 → 𝐴 ∈ AC 𝐵)) |
| 6 | fodomacn 10174 | . 2 ⊢ (𝐴 ∈ AC 𝐵 → (𝐹:𝐴⟶onto𝐵 → 𝐵 ≼ 𝐴)) | |
| 7 | 5, 6 | syli 40 | 1 ⊢ (𝐴 ∈ dom card → (𝐹:𝐴⟶onto𝐵 → 𝐵 ≼ 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2147 Vcvv 3454 class class class wbr 5108 dom cdm 5658 ⟶ontowfo 6564 ≼ cdom 9009 cardccrd 10053 AC wacn 10056 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-int 4913 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-se 5612 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-isom 6575 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-1st 8035 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-er 8755 df-map 8887 df-en 9012 df-dom 9013 df-card 10057 df-acn 10060 |
| This theorem is used by: fonum 10176 fodomfi2 10178 infpwfien 10180 inffien 10181 wdomnumr 10182 iunfictbso 10232 infmap2 10334 fictb 10361 cfflb 10376 cfslb2n 10385 fodomg 10639 dmct 10641 imadomnum 10653 fnrndomnum 10656 rankcf 10901 tskuni 10907 tskurn 10913 znnen 16424 qnnen 16425 cygctb 20157 1stcrestlem 23825 2ndcctbss 23829 2ndcomap 23832 2ndcsep 23833 tx1stc 24024 tx2ndc 24025 met1stc 24895 met2ndci 24896 re2ndc 25175 uniiccdif 25954 dyadmbl 25976 opnmblALT 25979 mbfimaopnlem 26031 aannenlem3 26714 rn1st 46558 |
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