Theorem qtopuni 22304

Description: The base set of the quotient topology. (Contributed by Mario Carneiro, 23-Mar-2015.)

Hypothesis

Ref	Expression
qtoptop.1	⊢ 𝑋 = ∪ 𝐽

Assertion

Ref	Expression
qtopuni	⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑌 = ∪ (𝐽 qTop 𝐹))

Proof of Theorem qtopuni

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssidd 3990	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑌 ⊆ 𝑌)
2		fof 6585	. . . . . . 7 ⊢ (𝐹:𝑋–onto→𝑌 → 𝐹:𝑋⟶𝑌)
3	2	adantl 484	. . . . . 6 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝐹:𝑋⟶𝑌)
4		fimacnv 6834	. . . . . 6 ⊢ (𝐹:𝑋⟶𝑌 → (◡𝐹 “ 𝑌) = 𝑋)
5	3, 4	syl 17	. . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (◡𝐹 “ 𝑌) = 𝑋)
6		qtoptop.1	. . . . . . 7 ⊢ 𝑋 = ∪ 𝐽
7	6	topopn 21508	. . . . . 6 ⊢ (𝐽 ∈ Top → 𝑋 ∈ 𝐽)
8	7	adantr 483	. . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑋 ∈ 𝐽)
9	5, 8	eqeltrd 2913	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (◡𝐹 “ 𝑌) ∈ 𝐽)
10	6	elqtop2 22303	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (𝑌 ∈ (𝐽 qTop 𝐹) ↔ (𝑌 ⊆ 𝑌 ∧ (◡𝐹 “ 𝑌) ∈ 𝐽)))
11	1, 9, 10	mpbir2and 711	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑌 ∈ (𝐽 qTop 𝐹))
12		elssuni 4861	. . 3 ⊢ (𝑌 ∈ (𝐽 qTop 𝐹) → 𝑌 ⊆ ∪ (𝐽 qTop 𝐹))
13	11, 12	syl 17	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑌 ⊆ ∪ (𝐽 qTop 𝐹))
14	6	elqtop2 22303	. . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (𝑥 ∈ (𝐽 qTop 𝐹) ↔ (𝑥 ⊆ 𝑌 ∧ (◡𝐹 “ 𝑥) ∈ 𝐽)))
15		simpl 485	. . . . . 6 ⊢ ((𝑥 ⊆ 𝑌 ∧ (◡𝐹 “ 𝑥) ∈ 𝐽) → 𝑥 ⊆ 𝑌)
16		velpw 4547	. . . . . 6 ⊢ (𝑥 ∈ 𝒫 𝑌 ↔ 𝑥 ⊆ 𝑌)
17	15, 16	sylibr 236	. . . . 5 ⊢ ((𝑥 ⊆ 𝑌 ∧ (◡𝐹 “ 𝑥) ∈ 𝐽) → 𝑥 ∈ 𝒫 𝑌)
18	14, 17	syl6bi 255	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (𝑥 ∈ (𝐽 qTop 𝐹) → 𝑥 ∈ 𝒫 𝑌))
19	18	ssrdv 3973	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → (𝐽 qTop 𝐹) ⊆ 𝒫 𝑌)
20		sspwuni 5015	. . 3 ⊢ ((𝐽 qTop 𝐹) ⊆ 𝒫 𝑌 ↔ ∪ (𝐽 qTop 𝐹) ⊆ 𝑌)
21	19, 20	sylib 220	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → ∪ (𝐽 qTop 𝐹) ⊆ 𝑌)
22	13, 21	eqssd 3984	1 ⊢ ((𝐽 ∈ Top ∧ 𝐹:𝑋–onto→𝑌) → 𝑌 = ∪ (𝐽 qTop 𝐹))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1533   ∈ wcel 2110   ⊆ wss 3936  𝒫 cpw 4539  ∪ cuni 4832  ^◡ccnv 5549   “ cima 5553  ⟶wf 6346  –onto→wfo 6348  (class class class)co 7150   qTop cqtop 16770  Topctop 21495

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3497  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4833  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-ov 7153  df-oprab 7154  df-mpo 7155  df-qtop 16774  df-top 21496

This theorem is referenced by:  qtoptopon  22306  qtopcmplem  22309  qtopkgen  22312  qtopt1  31094  qtophaus  31095  circtopn  31096