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Theorem istps 20786
 Description: Express the predicate "is a topological space." (Contributed by Mario Carneiro, 13-Aug-2015.)
Hypotheses
Ref Expression
istps.a 𝐴 = (Base‘𝐾)
istps.j 𝐽 = (TopOpen‘𝐾)
Assertion
Ref Expression
istps (𝐾 ∈ TopSp ↔ 𝐽 ∈ (TopOn‘𝐴))

Proof of Theorem istps
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 df-topsp 20785 . . 3 TopSp = {𝑓 ∣ (TopOpen‘𝑓) ∈ (TopOn‘(Base‘𝑓))}
21eleq2i 2722 . 2 (𝐾 ∈ TopSp ↔ 𝐾 ∈ {𝑓 ∣ (TopOpen‘𝑓) ∈ (TopOn‘(Base‘𝑓))})
3 topontop 20766 . . . 4 (𝐽 ∈ (TopOn‘𝐴) → 𝐽 ∈ Top)
4 0ntop 20758 . . . . . 6 ¬ ∅ ∈ Top
5 istps.j . . . . . . . 8 𝐽 = (TopOpen‘𝐾)
6 fvprc 6223 . . . . . . . 8 𝐾 ∈ V → (TopOpen‘𝐾) = ∅)
75, 6syl5eq 2697 . . . . . . 7 𝐾 ∈ V → 𝐽 = ∅)
87eleq1d 2715 . . . . . 6 𝐾 ∈ V → (𝐽 ∈ Top ↔ ∅ ∈ Top))
94, 8mtbiri 316 . . . . 5 𝐾 ∈ V → ¬ 𝐽 ∈ Top)
109con4i 113 . . . 4 (𝐽 ∈ Top → 𝐾 ∈ V)
113, 10syl 17 . . 3 (𝐽 ∈ (TopOn‘𝐴) → 𝐾 ∈ V)
12 fveq2 6229 . . . . 5 (𝑓 = 𝐾 → (TopOpen‘𝑓) = (TopOpen‘𝐾))
1312, 5syl6eqr 2703 . . . 4 (𝑓 = 𝐾 → (TopOpen‘𝑓) = 𝐽)
14 fveq2 6229 . . . . . 6 (𝑓 = 𝐾 → (Base‘𝑓) = (Base‘𝐾))
15 istps.a . . . . . 6 𝐴 = (Base‘𝐾)
1614, 15syl6eqr 2703 . . . . 5 (𝑓 = 𝐾 → (Base‘𝑓) = 𝐴)
1716fveq2d 6233 . . . 4 (𝑓 = 𝐾 → (TopOn‘(Base‘𝑓)) = (TopOn‘𝐴))
1813, 17eleq12d 2724 . . 3 (𝑓 = 𝐾 → ((TopOpen‘𝑓) ∈ (TopOn‘(Base‘𝑓)) ↔ 𝐽 ∈ (TopOn‘𝐴)))
1911, 18elab3 3390 . 2 (𝐾 ∈ {𝑓 ∣ (TopOpen‘𝑓) ∈ (TopOn‘(Base‘𝑓))} ↔ 𝐽 ∈ (TopOn‘𝐴))
202, 19bitri 264 1 (𝐾 ∈ TopSp ↔ 𝐽 ∈ (TopOn‘𝐴))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   ↔ wb 196   = wceq 1523   ∈ wcel 2030  {cab 2637  Vcvv 3231  ∅c0 3948  ‘cfv 5926  Basecbs 15904  TopOpenctopn 16129  Topctop 20746  TopOnctopon 20763  TopSpctps 20784 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-iota 5889  df-fun 5928  df-fv 5934  df-top 20747  df-topon 20764  df-topsp 20785 This theorem is referenced by:  istps2  20787  tpspropd  20790  tsettps  20793  indistps2ALT  20866  resstps  21039  prdstps  21480  imastps  21572  xpstopnlem2  21662  tmdtopon  21932  tgptopon  21933  istgp2  21942  oppgtmd  21948  distgp  21950  indistgp  21951  symgtgp  21952  qustgplem  21971  prdstmdd  21974  eltsms  21983  tsmscls  21988  tsmsgsum  21989  tsmsid  21990  tsmsmhm  21996  tsmsadd  21997  dvrcn  22034  cnmpt1vsca  22044  cnmpt2vsca  22045  tlmtgp  22046  ressusp  22116  tustps  22124  ucncn  22136  neipcfilu  22147  cnextucn  22154  ucnextcn  22155  isxms2  22300  ressxms  22377  prdsxmslem2  22381  nrgtrg  22541  cnfldtopon  22633  cnmpt1ds  22692  cnmpt2ds  22693  nmcn  22694  cnmpt1ip  23092  cnmpt2ip  23093  csscld  23094  clsocv  23095  minveclem4a  23247  mhmhmeotmd  30101  rrxtopon  40826  qndenserrnopnlem  40835
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