Theorem topontopn 21542

Description: Express the predicate "is a topological space." (Contributed by Mario Carneiro, 13-Aug-2015.)

Hypotheses

Ref	Expression
tsettps.a	⊢ 𝐴 = (Base‘𝐾)
tsettps.j	⊢ 𝐽 = (TopSet‘𝐾)

Assertion

Ref	Expression
topontopn	⊢ (𝐽 ∈ (TopOn‘𝐴) → 𝐽 = (TopOpen‘𝐾))

Proof of Theorem topontopn

Step	Hyp	Ref	Expression
1		toponuni 21516	. . . 4 ⊢ (𝐽 ∈ (TopOn‘𝐴) → 𝐴 = ∪ 𝐽)
2		eqimss2 4024	. . . 4 ⊢ (𝐴 = ∪ 𝐽 → ∪ 𝐽 ⊆ 𝐴)
3	1, 2	syl 17	. . 3 ⊢ (𝐽 ∈ (TopOn‘𝐴) → ∪ 𝐽 ⊆ 𝐴)
4		sspwuni 5015	. . 3 ⊢ (𝐽 ⊆ 𝒫 𝐴 ↔ ∪ 𝐽 ⊆ 𝐴)
5	3, 4	sylibr 236	. 2 ⊢ (𝐽 ∈ (TopOn‘𝐴) → 𝐽 ⊆ 𝒫 𝐴)
6		tsettps.a	. . 3 ⊢ 𝐴 = (Base‘𝐾)
7		tsettps.j	. . 3 ⊢ 𝐽 = (TopSet‘𝐾)
8	6, 7	topnid 16703	. 2 ⊢ (𝐽 ⊆ 𝒫 𝐴 → 𝐽 = (TopOpen‘𝐾))
9	5, 8	syl 17	1 ⊢ (𝐽 ∈ (TopOn‘𝐴) → 𝐽 = (TopOpen‘𝐾))

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2110   ⊆ wss 3936  𝒫 cpw 4539  ∪ cuni 4832  ‘cfv 6350  Basecbs 16477  TopSetcts 16565  TopOpenctopn 16689  TopOnctopon 21512

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 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3497  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4833  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-ov 7153  df-oprab 7154  df-mpo 7155  df-1st 7683  df-2nd 7684  df-rest 16690  df-topn 16691  df-topon 21513

This theorem is referenced by:  tsettps  21543  xrstopn  21810  cnfldms  23378  cnfldtopn  23384