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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 9722 | . . 3 ⊢ (𝑥 ∈ dom card ↔ ∃𝑦 𝑦 We 𝑥) | |
2 | 1 | albii 1823 | . 2 ⊢ (∀𝑥 𝑥 ∈ dom card ↔ ∀𝑥∃𝑦 𝑦 We 𝑥) |
3 | eqv 3431 | . 2 ⊢ (dom card = V ↔ ∀𝑥 𝑥 ∈ dom card) | |
4 | dfac8 9822 | . 2 ⊢ (CHOICE ↔ ∀𝑥∃𝑦 𝑦 We 𝑥) | |
5 | 2, 3, 4 | 3bitr4ri 303 | 1 ⊢ (CHOICE ↔ dom card = V) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∀wal 1537 = wceq 1539 ∃wex 1783 ∈ wcel 2108 Vcvv 3422 We wwe 5534 dom cdm 5580 cardccrd 9624 CHOICEwac 9802 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-en 8692 df-card 9628 df-ac 9803 |
This theorem is referenced by: dfac10c 9825 acacni 9827 dfac12a 9835 dfacfin7 10086 cardeqv 10156 gch2 10362 gchac 10368 lbsexg 20341 acufl 22976 fineqvacALT 32967 ttac 40774 dfac21 40807 dfacbasgrp 40849 |
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