MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  qtoptopon Structured version   Visualization version   GIF version

Theorem qtoptopon 21836
Description: The base set of the quotient topology. (Contributed by Mario Carneiro, 22-Aug-2015.)
Assertion
Ref Expression
qtoptopon ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → (𝐽 qTop 𝐹) ∈ (TopOn‘𝑌))

Proof of Theorem qtoptopon
StepHypRef Expression
1 toponuni 21047 . . . . . 6 (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = 𝐽)
2 foeq2 6328 . . . . . 6 (𝑋 = 𝐽 → (𝐹:𝑋onto𝑌𝐹: 𝐽onto𝑌))
31, 2syl 17 . . . . 5 (𝐽 ∈ (TopOn‘𝑋) → (𝐹:𝑋onto𝑌𝐹: 𝐽onto𝑌))
43biimpa 469 . . . 4 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝐹: 𝐽onto𝑌)
5 fofn 6333 . . . 4 (𝐹: 𝐽onto𝑌𝐹 Fn 𝐽)
64, 5syl 17 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝐹 Fn 𝐽)
7 topontop 21046 . . . 4 (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
8 eqid 2799 . . . . 5 𝐽 = 𝐽
98qtoptop 21832 . . . 4 ((𝐽 ∈ Top ∧ 𝐹 Fn 𝐽) → (𝐽 qTop 𝐹) ∈ Top)
107, 9sylan 576 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹 Fn 𝐽) → (𝐽 qTop 𝐹) ∈ Top)
116, 10syldan 586 . 2 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → (𝐽 qTop 𝐹) ∈ Top)
128qtopuni 21834 . . . 4 ((𝐽 ∈ Top ∧ 𝐹: 𝐽onto𝑌) → 𝑌 = (𝐽 qTop 𝐹))
137, 12sylan 576 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹: 𝐽onto𝑌) → 𝑌 = (𝐽 qTop 𝐹))
144, 13syldan 586 . 2 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝑌 = (𝐽 qTop 𝐹))
15 istopon 21045 . 2 ((𝐽 qTop 𝐹) ∈ (TopOn‘𝑌) ↔ ((𝐽 qTop 𝐹) ∈ Top ∧ 𝑌 = (𝐽 qTop 𝐹)))
1611, 14, 15sylanbrc 579 1 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → (𝐽 qTop 𝐹) ∈ (TopOn‘𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198  wa 385   = wceq 1653  wcel 2157   cuni 4628   Fn wfn 6096  ontowfo 6099  cfv 6101  (class class class)co 6878   qTop cqtop 16478  Topctop 21026  TopOnctopon 21043
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-ral 3094  df-rex 3095  df-reu 3096  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-iun 4712  df-br 4844  df-opab 4906  df-mpt 4923  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-ov 6881  df-oprab 6882  df-mpt2 6883  df-qtop 16482  df-top 21027  df-topon 21044
This theorem is referenced by:  qtopid  21837  qtopcld  21845  qtopcn  21846  qtopeu  21848  qtoprest  21849  imastps  21853  kqtopon  21859  qtopf1  21948  qtophmeo  21949  qustgplem  22252  qtophaus  30419
  Copyright terms: Public domain W3C validator