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Mirrors > Home > MPE Home > Th. List > hausmapdom | Structured version Visualization version GIF version |
Description: If 𝑋 is a first-countable Hausdorff space, then the cardinality of the closure of a set 𝐴 is bounded by ℕ to the power 𝐴. In particular, a first-countable Hausdorff space with a dense subset 𝐴 has cardinality at most 𝐴↑ℕ, and a separable first-countable Hausdorff space has cardinality at most 𝒫 ℕ. (Compare hauspwpwdom 24012 to see a weaker result if the assumption of first-countability is omitted.) (Contributed by Mario Carneiro, 9-Apr-2015.) |
Ref | Expression |
---|---|
hauspwdom.1 | ⊢ 𝑋 = ∪ 𝐽 |
Ref | Expression |
---|---|
hausmapdom | ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) ≼ (𝐴 ↑m ℕ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hauspwdom.1 | . . . . . . . 8 ⊢ 𝑋 = ∪ 𝐽 | |
2 | 1 | 1stcelcls 23485 | . . . . . . 7 ⊢ ((𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥))) |
3 | 2 | 3adant1 1129 | . . . . . 6 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥))) |
4 | uniexg 7759 | . . . . . . . . . . . 12 ⊢ (𝐽 ∈ Haus → ∪ 𝐽 ∈ V) | |
5 | 4 | 3ad2ant1 1132 | . . . . . . . . . . 11 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ∪ 𝐽 ∈ V) |
6 | 1, 5 | eqeltrid 2843 | . . . . . . . . . 10 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → 𝑋 ∈ V) |
7 | simp3 1137 | . . . . . . . . . 10 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → 𝐴 ⊆ 𝑋) | |
8 | 6, 7 | ssexd 5330 | . . . . . . . . 9 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → 𝐴 ∈ V) |
9 | nnex 12270 | . . . . . . . . 9 ⊢ ℕ ∈ V | |
10 | elmapg 8878 | . . . . . . . . 9 ⊢ ((𝐴 ∈ V ∧ ℕ ∈ V) → (𝑓 ∈ (𝐴 ↑m ℕ) ↔ 𝑓:ℕ⟶𝐴)) | |
11 | 8, 9, 10 | sylancl 586 | . . . . . . . 8 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑓 ∈ (𝐴 ↑m ℕ) ↔ 𝑓:ℕ⟶𝐴)) |
12 | 11 | anbi1d 631 | . . . . . . 7 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ((𝑓 ∈ (𝐴 ↑m ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥) ↔ (𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥))) |
13 | 12 | exbidv 1919 | . . . . . 6 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (∃𝑓(𝑓 ∈ (𝐴 ↑m ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥) ↔ ∃𝑓(𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥))) |
14 | 3, 13 | bitr4d 282 | . . . . 5 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓 ∈ (𝐴 ↑m ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥))) |
15 | df-rex 3069 | . . . . 5 ⊢ (∃𝑓 ∈ (𝐴 ↑m ℕ)𝑓(⇝𝑡‘𝐽)𝑥 ↔ ∃𝑓(𝑓 ∈ (𝐴 ↑m ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥)) | |
16 | 14, 15 | bitr4di 289 | . . . 4 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓 ∈ (𝐴 ↑m ℕ)𝑓(⇝𝑡‘𝐽)𝑥)) |
17 | vex 3482 | . . . . 5 ⊢ 𝑥 ∈ V | |
18 | 17 | elima 6085 | . . . 4 ⊢ (𝑥 ∈ ((⇝𝑡‘𝐽) “ (𝐴 ↑m ℕ)) ↔ ∃𝑓 ∈ (𝐴 ↑m ℕ)𝑓(⇝𝑡‘𝐽)𝑥) |
19 | 16, 18 | bitr4di 289 | . . 3 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ 𝑥 ∈ ((⇝𝑡‘𝐽) “ (𝐴 ↑m ℕ)))) |
20 | 19 | eqrdv 2733 | . 2 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) = ((⇝𝑡‘𝐽) “ (𝐴 ↑m ℕ))) |
21 | ovex 7464 | . . 3 ⊢ (𝐴 ↑m ℕ) ∈ V | |
22 | lmfun 23405 | . . . 4 ⊢ (𝐽 ∈ Haus → Fun (⇝𝑡‘𝐽)) | |
23 | 22 | 3ad2ant1 1132 | . . 3 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → Fun (⇝𝑡‘𝐽)) |
24 | imadomg 10572 | . . 3 ⊢ ((𝐴 ↑m ℕ) ∈ V → (Fun (⇝𝑡‘𝐽) → ((⇝𝑡‘𝐽) “ (𝐴 ↑m ℕ)) ≼ (𝐴 ↑m ℕ))) | |
25 | 21, 23, 24 | mpsyl 68 | . 2 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ((⇝𝑡‘𝐽) “ (𝐴 ↑m ℕ)) ≼ (𝐴 ↑m ℕ)) |
26 | 20, 25 | eqbrtrd 5170 | 1 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1stω ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) ≼ (𝐴 ↑m ℕ)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1537 ∃wex 1776 ∈ wcel 2106 ∃wrex 3068 Vcvv 3478 ⊆ wss 3963 ∪ cuni 4912 class class class wbr 5148 “ cima 5692 Fun wfun 6557 ⟶wf 6559 ‘cfv 6563 (class class class)co 7431 ↑m cmap 8865 ≼ cdom 8982 ℕcn 12264 clsccl 23042 ⇝𝑡clm 23250 Hauscha 23332 1stωc1stc 23461 |
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 ax-inf2 9679 ax-cc 10473 ax-ac2 10501 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
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-nel 3045 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-iin 4999 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-lim 6391 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-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8013 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-2o 8506 df-er 8744 df-map 8867 df-pm 8868 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-card 9977 df-acn 9980 df-ac 10154 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-nn 12265 df-n0 12525 df-z 12612 df-uz 12877 df-fz 13545 df-top 22916 df-topon 22933 df-cld 23043 df-ntr 23044 df-cls 23045 df-lm 23253 df-haus 23339 df-1stc 23463 |
This theorem is referenced by: hauspwdom 23525 |
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