Theorem qtoptop 22851

Description: The quotient topology is a topology. (Contributed by Mario Carneiro, 23-Mar-2015.)

Hypothesis

Ref	Expression
qtoptop.1	⊢ 𝑋 = ∪ 𝐽

Assertion

Ref	Expression
qtoptop	⊢ ((𝐽 ∈ Top ∧ 𝐹 Fn 𝑋) → (𝐽 qTop 𝐹) ∈ Top)

Proof of Theorem qtoptop

Step	Hyp	Ref	Expression
1		simpl 483	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹 Fn 𝑋) → 𝐽 ∈ Top)
2		id 22	. . 3 ⊢ (𝐹 Fn 𝑋 → 𝐹 Fn 𝑋)
3		qtoptop.1	. . . 4 ⊢ 𝑋 = ∪ 𝐽
4	3	topopn 22055	. . 3 ⊢ (𝐽 ∈ Top → 𝑋 ∈ 𝐽)
5		fnex 7093	. . 3 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝐽) → 𝐹 ∈ V)
6	2, 4, 5	syl2anr 597	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹 Fn 𝑋) → 𝐹 ∈ V)
7		fnfun 6533	. . 3 ⊢ (𝐹 Fn 𝑋 → Fun 𝐹)
8	7	adantl 482	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹 Fn 𝑋) → Fun 𝐹)
9		qtoptop2 22850	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹 ∈ V ∧ Fun 𝐹) → (𝐽 qTop 𝐹) ∈ Top)
10	1, 6, 8, 9	syl3anc 1370	1 ⊢ ((𝐽 ∈ Top ∧ 𝐹 Fn 𝑋) → (𝐽 qTop 𝐹) ∈ Top)

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1539   ∈ wcel 2106  Vcvv 3432  ∪ cuni 4839  Fun wfun 6427   Fn wfn 6428  (class class class)co 7275   qTop cqtop 17214  Topctop 22042

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-ov 7278  df-oprab 7279  df-mpo 7280  df-qtop 17218  df-top 22043

This theorem is referenced by:  qtoptopon  22855  qtopkgen  22861  qtopt1  31785  qtophaus  31786