Theorem tpstop 21539

Description: The topology extractor on a topological space is a topology. (Contributed by FL, 27-Jun-2014.)

Hypothesis

Ref	Expression
tpstop.j	⊢ 𝐽 = (TopOpen‘𝐾)

Assertion

Ref	Expression
tpstop	⊢ (𝐾 ∈ TopSp → 𝐽 ∈ Top)

Proof of Theorem tpstop

Step	Hyp	Ref	Expression
1		eqid 2821	. . 3 ⊢ (Base‘𝐾) = (Base‘𝐾)
2		tpstop.j	. . 3 ⊢ 𝐽 = (TopOpen‘𝐾)
3	1, 2	istps2 21537	. 2 ⊢ (𝐾 ∈ TopSp ↔ (𝐽 ∈ Top ∧ (Base‘𝐾) = ∪ 𝐽))
4	3	simplbi 500	1 ⊢ (𝐾 ∈ TopSp → 𝐽 ∈ Top)

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2110  ∪ cuni 4831  ‘cfv 6349  Basecbs 16477  TopOpenctopn 16689  Topctop 21495  TopSpctps 21534

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 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  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-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5059  df-opab 5121  df-mpt 5139  df-id 5454  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-iota 6308  df-fun 6351  df-fv 6357  df-top 21496  df-topon 21513  df-topsp 21535

This theorem is referenced by:  mreclatdemoBAD  21698  prdstmdd  22726  invrcn  22783  cnextucn  22906  prdsxmslem2  23133  rlmbn  23958  sibfinima  31592  sibfof  31593  rrxtop  42568