Theorem tpstop 21545

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 21543	. 2 ⊢ (𝐾 ∈ TopSp ↔ (𝐽 ∈ Top ∧ (Base‘𝐾) = ∪ 𝐽))
4	3	simplbi 500	1 ⊢ (𝐾 ∈ TopSp → 𝐽 ∈ Top)

Syntax hints:   → wi 4   = wceq 1537   ∈ wcel 2114  ∪ cuni 4838  ‘cfv 6355  Basecbs 16483  TopOpenctopn 16695  Topctop 21501  TopSpctps 21540

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  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 3773  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-mpt 5147  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-iota 6314  df-fun 6357  df-fv 6363  df-top 21502  df-topon 21519  df-topsp 21541

This theorem is referenced by:  mreclatdemoBAD  21704  prdstmdd  22732  invrcn  22789  cnextucn  22912  prdsxmslem2  23139  rlmbn  23964  sibfinima  31597  sibfof  31598  rrxtop  42594