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Theorem qtoptopon 22240
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 topontop 21449 . . 3 (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
2 toponuni 21450 . . . . . 6 (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = 𝐽)
3 foeq2 6580 . . . . . 6 (𝑋 = 𝐽 → (𝐹:𝑋onto𝑌𝐹: 𝐽onto𝑌))
42, 3syl 17 . . . . 5 (𝐽 ∈ (TopOn‘𝑋) → (𝐹:𝑋onto𝑌𝐹: 𝐽onto𝑌))
54biimpa 477 . . . 4 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝐹: 𝐽onto𝑌)
6 fofn 6585 . . . 4 (𝐹: 𝐽onto𝑌𝐹 Fn 𝐽)
75, 6syl 17 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝐹 Fn 𝐽)
8 eqid 2818 . . . 4 𝐽 = 𝐽
98qtoptop 22236 . . 3 ((𝐽 ∈ Top ∧ 𝐹 Fn 𝐽) → (𝐽 qTop 𝐹) ∈ Top)
101, 7, 9syl2an2r 681 . 2 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → (𝐽 qTop 𝐹) ∈ Top)
118qtopuni 22238 . . 3 ((𝐽 ∈ Top ∧ 𝐹: 𝐽onto𝑌) → 𝑌 = (𝐽 qTop 𝐹))
121, 5, 11syl2an2r 681 . 2 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → 𝑌 = (𝐽 qTop 𝐹))
13 istopon 21448 . 2 ((𝐽 qTop 𝐹) ∈ (TopOn‘𝑌) ↔ ((𝐽 qTop 𝐹) ∈ Top ∧ 𝑌 = (𝐽 qTop 𝐹)))
1410, 12, 13sylanbrc 583 1 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹:𝑋onto𝑌) → (𝐽 qTop 𝐹) ∈ (TopOn‘𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396   = wceq 1528  wcel 2105   cuni 4830   Fn wfn 6343  ontowfo 6346  cfv 6348  (class class class)co 7145   qTop cqtop 16764  Topctop 21429  TopOnctopon 21446
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-rep 5181  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7450
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ne 3014  df-ral 3140  df-rex 3141  df-reu 3142  df-rab 3144  df-v 3494  df-sbc 3770  df-csb 3881  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-pw 4537  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-iun 4912  df-br 5058  df-opab 5120  df-mpt 5138  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-ov 7148  df-oprab 7149  df-mpo 7150  df-qtop 16768  df-top 21430  df-topon 21447
This theorem is referenced by:  qtopid  22241  qtopcld  22249  qtopcn  22250  qtopeu  22252  qtoprest  22253  imastps  22257  kqtopon  22263  qtopf1  22352  qtophmeo  22353  qustgplem  22656  qtophaus  30999
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