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Mirrors > Home > MPE Home > Th. List > acnnum | Structured version Visualization version GIF version |
Description: A set 𝑋 which has choice sequences on it of length 𝒫 𝑋 is well-orderable (and hence has choice sequences of every length). (Contributed by Mario Carneiro, 31-Aug-2015.) |
Ref | Expression |
---|---|
acnnum | ⊢ (𝑋 ∈ AC 𝒫 𝑋 ↔ 𝑋 ∈ dom card) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pwexg 5301 | . . . . . . 7 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → 𝒫 𝑋 ∈ V) | |
2 | difss 4066 | . . . . . . 7 ⊢ (𝒫 𝑋 ∖ {∅}) ⊆ 𝒫 𝑋 | |
3 | ssdomg 8786 | . . . . . . 7 ⊢ (𝒫 𝑋 ∈ V → ((𝒫 𝑋 ∖ {∅}) ⊆ 𝒫 𝑋 → (𝒫 𝑋 ∖ {∅}) ≼ 𝒫 𝑋)) | |
4 | 1, 2, 3 | mpisyl 21 | . . . . . 6 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → (𝒫 𝑋 ∖ {∅}) ≼ 𝒫 𝑋) |
5 | acndom 9807 | . . . . . 6 ⊢ ((𝒫 𝑋 ∖ {∅}) ≼ 𝒫 𝑋 → (𝑋 ∈ AC 𝒫 𝑋 → 𝑋 ∈ AC (𝒫 𝑋 ∖ {∅}))) | |
6 | 4, 5 | mpcom 38 | . . . . 5 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → 𝑋 ∈ AC (𝒫 𝑋 ∖ {∅})) |
7 | eldifsn 4720 | . . . . . . 7 ⊢ (𝑥 ∈ (𝒫 𝑋 ∖ {∅}) ↔ (𝑥 ∈ 𝒫 𝑋 ∧ 𝑥 ≠ ∅)) | |
8 | elpwi 4542 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝒫 𝑋 → 𝑥 ⊆ 𝑋) | |
9 | 8 | anim1i 615 | . . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 𝑋 ∧ 𝑥 ≠ ∅) → (𝑥 ⊆ 𝑋 ∧ 𝑥 ≠ ∅)) |
10 | 7, 9 | sylbi 216 | . . . . . 6 ⊢ (𝑥 ∈ (𝒫 𝑋 ∖ {∅}) → (𝑥 ⊆ 𝑋 ∧ 𝑥 ≠ ∅)) |
11 | 10 | rgen 3074 | . . . . 5 ⊢ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑥 ⊆ 𝑋 ∧ 𝑥 ≠ ∅) |
12 | acni2 9802 | . . . . 5 ⊢ ((𝑋 ∈ AC (𝒫 𝑋 ∖ {∅}) ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑥 ⊆ 𝑋 ∧ 𝑥 ≠ ∅)) → ∃𝑓(𝑓:(𝒫 𝑋 ∖ {∅})⟶𝑋 ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥)) | |
13 | 6, 11, 12 | sylancl 586 | . . . 4 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → ∃𝑓(𝑓:(𝒫 𝑋 ∖ {∅})⟶𝑋 ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥)) |
14 | simpr 485 | . . . . . 6 ⊢ ((𝑓:(𝒫 𝑋 ∖ {∅})⟶𝑋 ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥) → ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥) | |
15 | 7 | imbi1i 350 | . . . . . . . 8 ⊢ ((𝑥 ∈ (𝒫 𝑋 ∖ {∅}) → (𝑓‘𝑥) ∈ 𝑥) ↔ ((𝑥 ∈ 𝒫 𝑋 ∧ 𝑥 ≠ ∅) → (𝑓‘𝑥) ∈ 𝑥)) |
16 | impexp 451 | . . . . . . . 8 ⊢ (((𝑥 ∈ 𝒫 𝑋 ∧ 𝑥 ≠ ∅) → (𝑓‘𝑥) ∈ 𝑥) ↔ (𝑥 ∈ 𝒫 𝑋 → (𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥))) | |
17 | 15, 16 | bitri 274 | . . . . . . 7 ⊢ ((𝑥 ∈ (𝒫 𝑋 ∖ {∅}) → (𝑓‘𝑥) ∈ 𝑥) ↔ (𝑥 ∈ 𝒫 𝑋 → (𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥))) |
18 | 17 | ralbii2 3090 | . . . . . 6 ⊢ (∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥 ↔ ∀𝑥 ∈ 𝒫 𝑋(𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥)) |
19 | 14, 18 | sylib 217 | . . . . 5 ⊢ ((𝑓:(𝒫 𝑋 ∖ {∅})⟶𝑋 ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥) → ∀𝑥 ∈ 𝒫 𝑋(𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥)) |
20 | 19 | eximi 1837 | . . . 4 ⊢ (∃𝑓(𝑓:(𝒫 𝑋 ∖ {∅})⟶𝑋 ∧ ∀𝑥 ∈ (𝒫 𝑋 ∖ {∅})(𝑓‘𝑥) ∈ 𝑥) → ∃𝑓∀𝑥 ∈ 𝒫 𝑋(𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥)) |
21 | 13, 20 | syl 17 | . . 3 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → ∃𝑓∀𝑥 ∈ 𝒫 𝑋(𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥)) |
22 | dfac8a 9786 | . . 3 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → (∃𝑓∀𝑥 ∈ 𝒫 𝑋(𝑥 ≠ ∅ → (𝑓‘𝑥) ∈ 𝑥) → 𝑋 ∈ dom card)) | |
23 | 21, 22 | mpd 15 | . 2 ⊢ (𝑋 ∈ AC 𝒫 𝑋 → 𝑋 ∈ dom card) |
24 | pwexg 5301 | . . 3 ⊢ (𝑋 ∈ dom card → 𝒫 𝑋 ∈ V) | |
25 | numacn 9805 | . . 3 ⊢ (𝒫 𝑋 ∈ V → (𝑋 ∈ dom card → 𝑋 ∈ AC 𝒫 𝑋)) | |
26 | 24, 25 | mpcom 38 | . 2 ⊢ (𝑋 ∈ dom card → 𝑋 ∈ AC 𝒫 𝑋) |
27 | 23, 26 | impbii 208 | 1 ⊢ (𝑋 ∈ AC 𝒫 𝑋 ↔ 𝑋 ∈ dom card) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∃wex 1782 ∈ wcel 2106 ≠ wne 2943 ∀wral 3064 Vcvv 3432 ∖ cdif 3884 ⊆ wss 3887 ∅c0 4256 𝒫 cpw 4533 {csn 4561 class class class wbr 5074 dom cdm 5589 ⟶wf 6429 ‘cfv 6433 ≼ cdom 8731 cardccrd 9693 AC wacn 9696 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-se 5545 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-isom 6442 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-er 8498 df-map 8617 df-en 8734 df-dom 8735 df-fin 8737 df-card 9697 df-acn 9700 |
This theorem is referenced by: dfac13 9898 |
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