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| Mirrors > Home > MPE Home > Th. List > dfac10 | Structured version Visualization version GIF version | ||
| Description: Axiom of Choice equivalent: the cardinality function measures every set. (Contributed by Mario Carneiro, 6-May-2015.) |
| Ref | Expression |
|---|---|
| dfac10 | ⊢ (CHOICE ↔ dom card = V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ween 10153 | . . 3 ⊢ (𝑥 ∈ dom card ↔ ∃𝑦 𝑦 We 𝑥) | |
| 2 | 1 | albii 1852 | . 2 ⊢ (∀𝑥 𝑥 ∈ dom card ↔ ∀𝑥∃𝑦 𝑦 We 𝑥) |
| 3 | eqv 3464 | . 2 ⊢ (dom card = V ↔ ∀𝑥 𝑥 ∈ dom card) | |
| 4 | dfac8 10253 | . 2 ⊢ (CHOICE ↔ ∀𝑥∃𝑦 𝑦 We 𝑥) | |
| 5 | 2, 3, 4 | 3bitr4ri 307 | 1 ⊢ (CHOICE ↔ dom card = V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∀wal 1568 = wceq 1570 ∃wex 1812 ∈ wcel 2147 Vcvv 3454 We wwe 5610 dom cdm 5658 cardccrd 10053 CHOICEwac 10233 |
| 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-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-en 9012 df-card 10057 df-ac 10234 |
| This theorem is used by: dfac10c 10256 acacni 10258 dfac12a 10266 dfacfin7 10516 cardeqv 10586 gch2 10799 gchac 10805 lbsexg 21493 acufl 24291 acnum 35888 rncardr1prc 35891 acwer1prc 35893 fineqvacALT 35926 ttac 44309 dfac21 44334 dfacbasgrp 44375 |
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