Theorem hausmapdom 21213

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 21702 to see a weaker result if the assumption of first-countability is omitted.) (Contributed by Mario Carneiro, 9-Apr-2015.)

Hypothesis

Ref	Expression
hauspwdom.1	⊢ 𝑋 = ∪ 𝐽

Assertion

Ref	Expression
hausmapdom	⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) ≼ (𝐴 ↑𝑚 ℕ))

Proof of Theorem hausmapdom

Dummy variables 𝑥 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		hauspwdom.1	. . . . . . . 8 ⊢ 𝑋 = ∪ 𝐽
2	1	1stcelcls 21174	. . . . . . 7 ⊢ ((𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥)))
3	2	3adant1 1077	. . . . . 6 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓:ℕ⟶𝐴 ∧ 𝑓(⇝𝑡‘𝐽)𝑥)))
4		uniexg 6908	. . . . . . . . . . . 12 ⊢ (𝐽 ∈ Haus → ∪ 𝐽 ∈ V)
5	4	3ad2ant1 1080	. . . . . . . . . . 11 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → ∪ 𝐽 ∈ V)
6	1, 5	syl5eqel 2702	. . . . . . . . . 10 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → 𝑋 ∈ V)
7		simp3 1061	. . . . . . . . . 10 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → 𝐴 ⊆ 𝑋)
8	6, 7	ssexd 4765	. . . . . . . . 9 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → 𝐴 ∈ V)
9		nnex 10970	. . . . . . . . 9 ⊢ ℕ ∈ V
10		elmapg 7815	. . . . . . . . 9 ⊢ ((𝐴 ∈ V ∧ ℕ ∈ V) → (𝑓 ∈ (𝐴 ↑𝑚 ℕ) ↔ 𝑓:ℕ⟶𝐴))
11	8, 9, 10	sylancl 693	. . . . . . . 8 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑓 ∈ (𝐴 ↑𝑚 ℕ) ↔ 𝑓:ℕ⟶𝐴))
12	11	anbi1d 740	. . . . . . 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 1847	. . . . . 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 271	. . . . 5 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓(𝑓 ∈ (𝐴 ↑𝑚 ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥)))
15		df-rex 2913	. . . . 5 ⊢ (∃𝑓 ∈ (𝐴 ↑𝑚 ℕ)𝑓(⇝𝑡‘𝐽)𝑥 ↔ ∃𝑓(𝑓 ∈ (𝐴 ↑𝑚 ℕ) ∧ 𝑓(⇝𝑡‘𝐽)𝑥))
16	14, 15	syl6bbr 278	. . . 4 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ ∃𝑓 ∈ (𝐴 ↑𝑚 ℕ)𝑓(⇝𝑡‘𝐽)𝑥))
17		vex 3189	. . . . 5 ⊢ 𝑥 ∈ V
18	17	elima 5430	. . . 4 ⊢ (𝑥 ∈ ((⇝𝑡‘𝐽) “ (𝐴 ↑𝑚 ℕ)) ↔ ∃𝑓 ∈ (𝐴 ↑𝑚 ℕ)𝑓(⇝𝑡‘𝐽)𝑥)
19	16, 18	syl6bbr 278	. . 3 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ 𝑥 ∈ ((⇝𝑡‘𝐽) “ (𝐴 ↑𝑚 ℕ))))
20	19	eqrdv 2619	. 2 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) = ((⇝𝑡‘𝐽) “ (𝐴 ↑𝑚 ℕ)))
21		ovex 6632	. . 3 ⊢ (𝐴 ↑𝑚 ℕ) ∈ V
22		lmfun 21095	. . . 4 ⊢ (𝐽 ∈ Haus → Fun (⇝𝑡‘𝐽))
23	22	3ad2ant1 1080	. . 3 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → Fun (⇝𝑡‘𝐽))
24		imadomg 9300	. . 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 4635	1 ⊢ ((𝐽 ∈ Haus ∧ 𝐽 ∈ 1st𝜔 ∧ 𝐴 ⊆ 𝑋) → ((cls‘𝐽)‘𝐴) ≼ (𝐴 ↑𝑚 ℕ))

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1036   = wceq 1480  ∃wex 1701   ∈ wcel 1987  ∃wrex 2908  Vcvv 3186   ⊆ wss 3555  ∪ cuni 4402   class class class wbr 4613   “ cima 5077  Fun wfun 5841  ⟶wf 5843  ‘cfv 5847  (class class class)co 6604   ↑_𝑚 cmap 7802   ≼ cdom 7897  ℕcn 10964  clsccl 20732  ⇝_𝑡clm 20940  Hauscha 21022  1^st𝜔c1stc 21150

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-inf2 8482  ax-cc 9201  ax-ac2 9229  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-iin 4488  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-se 5034  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-isom 5856  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-map 7804  df-pm 7805  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-card 8709  df-acn 8712  df-ac 8883  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-nn 10965  df-n0 11237  df-z 11322  df-uz 11632  df-fz 12269  df-top 20621  df-topon 20623  df-cld 20733  df-ntr 20734  df-cls 20735  df-lm 20943  df-haus 21029  df-1stc 21152

This theorem is referenced by:  hauspwdom  21214