Theorem kqfvima 23668

Description: When the image set is open, the quotient map satisfies a partial converse to fnfvima 7225, which is normally only true for injective functions. (Contributed by Mario Carneiro, 25-Aug-2015.)

Hypothesis

Ref	Expression
kqval.2	⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦})

Assertion

Ref	Expression
kqfvima	⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → (𝐴 ∈ 𝑈 ↔ (𝐹‘𝐴) ∈ (𝐹 “ 𝑈)))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐽,𝑦   𝑥,𝑋,𝑦

Allowed substitution hints:   𝑈(𝑥,𝑦)   𝐹(𝑥,𝑦)

Proof of Theorem kqfvima

Dummy variables 𝑤 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		kqval.2	. . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦})
2	1	kqffn 23663	. . . 4 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐹 Fn 𝑋)
3	2	3ad2ant1 1133	. . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → 𝐹 Fn 𝑋)
4		toponss 22865	. . . 4 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽) → 𝑈 ⊆ 𝑋)
5	4	3adant3 1132	. . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → 𝑈 ⊆ 𝑋)
6		fnfvima 7225	. . . 4 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑈 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑈) → (𝐹‘𝐴) ∈ (𝐹 “ 𝑈))
7	6	3expia 1121	. . 3 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑈 ⊆ 𝑋) → (𝐴 ∈ 𝑈 → (𝐹‘𝐴) ∈ (𝐹 “ 𝑈)))
8	3, 5, 7	syl2anc 584	. 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → (𝐴 ∈ 𝑈 → (𝐹‘𝐴) ∈ (𝐹 “ 𝑈)))
9		fnfun 6638	. . . 4 ⊢ (𝐹 Fn 𝑋 → Fun 𝐹)
10		fvelima 6944	. . . . 5 ⊢ ((Fun 𝐹 ∧ (𝐹‘𝐴) ∈ (𝐹 “ 𝑈)) → ∃𝑧 ∈ 𝑈 (𝐹‘𝑧) = (𝐹‘𝐴))
11	10	ex 412	. . . 4 ⊢ (Fun 𝐹 → ((𝐹‘𝐴) ∈ (𝐹 “ 𝑈) → ∃𝑧 ∈ 𝑈 (𝐹‘𝑧) = (𝐹‘𝐴)))
12	3, 9, 11	3syl 18	. . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) ∈ (𝐹 “ 𝑈) → ∃𝑧 ∈ 𝑈 (𝐹‘𝑧) = (𝐹‘𝐴)))
13		simpl1 1192	. . . . . . . 8 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → 𝐽 ∈ (TopOn‘𝑋))
14	5	sselda 3958	. . . . . . . 8 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → 𝑧 ∈ 𝑋)
15		simpl3 1194	. . . . . . . 8 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → 𝐴 ∈ 𝑋)
16	1	kqfeq 23662	. . . . . . . 8 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑧 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝑧) = (𝐹‘𝐴) ↔ ∀𝑦 ∈ 𝐽 (𝑧 ∈ 𝑦 ↔ 𝐴 ∈ 𝑦)))
17	13, 14, 15, 16	syl3anc 1373	. . . . . . 7 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → ((𝐹‘𝑧) = (𝐹‘𝐴) ↔ ∀𝑦 ∈ 𝐽 (𝑧 ∈ 𝑦 ↔ 𝐴 ∈ 𝑦)))
18		eleq2 2823	. . . . . . . . 9 ⊢ (𝑦 = 𝑤 → (𝑧 ∈ 𝑦 ↔ 𝑧 ∈ 𝑤))
19		eleq2 2823	. . . . . . . . 9 ⊢ (𝑦 = 𝑤 → (𝐴 ∈ 𝑦 ↔ 𝐴 ∈ 𝑤))
20	18, 19	bibi12d 345	. . . . . . . 8 ⊢ (𝑦 = 𝑤 → ((𝑧 ∈ 𝑦 ↔ 𝐴 ∈ 𝑦) ↔ (𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤)))
21	20	cbvralvw 3220	. . . . . . 7 ⊢ (∀𝑦 ∈ 𝐽 (𝑧 ∈ 𝑦 ↔ 𝐴 ∈ 𝑦) ↔ ∀𝑤 ∈ 𝐽 (𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤))
22	17, 21	bitrdi 287	. . . . . 6 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → ((𝐹‘𝑧) = (𝐹‘𝐴) ↔ ∀𝑤 ∈ 𝐽 (𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤)))
23		simpl2 1193	. . . . . . 7 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → 𝑈 ∈ 𝐽)
24		eleq2 2823	. . . . . . . . 9 ⊢ (𝑤 = 𝑈 → (𝑧 ∈ 𝑤 ↔ 𝑧 ∈ 𝑈))
25		eleq2 2823	. . . . . . . . 9 ⊢ (𝑤 = 𝑈 → (𝐴 ∈ 𝑤 ↔ 𝐴 ∈ 𝑈))
26	24, 25	bibi12d 345	. . . . . . . 8 ⊢ (𝑤 = 𝑈 → ((𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤) ↔ (𝑧 ∈ 𝑈 ↔ 𝐴 ∈ 𝑈)))
27	26	rspcv 3597	. . . . . . 7 ⊢ (𝑈 ∈ 𝐽 → (∀𝑤 ∈ 𝐽 (𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤) → (𝑧 ∈ 𝑈 ↔ 𝐴 ∈ 𝑈)))
28	23, 27	syl 17	. . . . . 6 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → (∀𝑤 ∈ 𝐽 (𝑧 ∈ 𝑤 ↔ 𝐴 ∈ 𝑤) → (𝑧 ∈ 𝑈 ↔ 𝐴 ∈ 𝑈)))
29	22, 28	sylbid 240	. . . . 5 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → ((𝐹‘𝑧) = (𝐹‘𝐴) → (𝑧 ∈ 𝑈 ↔ 𝐴 ∈ 𝑈)))
30		simpr 484	. . . . 5 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → 𝑧 ∈ 𝑈)
31		biimp 215	. . . . 5 ⊢ ((𝑧 ∈ 𝑈 ↔ 𝐴 ∈ 𝑈) → (𝑧 ∈ 𝑈 → 𝐴 ∈ 𝑈))
32	29, 30, 31	syl6ci 71	. . . 4 ⊢ (((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) ∧ 𝑧 ∈ 𝑈) → ((𝐹‘𝑧) = (𝐹‘𝐴) → 𝐴 ∈ 𝑈))
33	32	rexlimdva 3141	. . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → (∃𝑧 ∈ 𝑈 (𝐹‘𝑧) = (𝐹‘𝐴) → 𝐴 ∈ 𝑈))
34	12, 33	syld 47	. 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) ∈ (𝐹 “ 𝑈) → 𝐴 ∈ 𝑈))
35	8, 34	impbid 212	1 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑈 ∈ 𝐽 ∧ 𝐴 ∈ 𝑋) → (𝐴 ∈ 𝑈 ↔ (𝐹‘𝐴) ∈ (𝐹 “ 𝑈)))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∧ w3a 1086   = wceq 1540   ∈ wcel 2108  ∀wral 3051  ∃wrex 3060  {crab 3415   ⊆ wss 3926   ↦ cmpt 5201   “ cima 5657  Fun wfun 6525   Fn wfn 6526  ‘cfv 6531  TopOnctopon 22848

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2707  ax-sep 5266  ax-nul 5276  ax-pow 5335  ax-pr 5402  ax-un 7729

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2539  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2809  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3061  df-rab 3416  df-v 3461  df-dif 3929  df-un 3931  df-in 3933  df-ss 3943  df-nul 4309  df-if 4501  df-pw 4577  df-sn 4602  df-pr 4604  df-op 4608  df-uni 4884  df-br 5120  df-opab 5182  df-mpt 5202  df-id 5548  df-xp 5660  df-rel 5661  df-cnv 5662  df-co 5663  df-dm 5664  df-rn 5665  df-res 5666  df-ima 5667  df-iota 6484  df-fun 6533  df-fn 6534  df-f 6535  df-fv 6539  df-topon 22849

This theorem is referenced by:  kqsat  23669  kqdisj  23670  kqcldsat  23671  kqt0lem  23674  isr0  23675  regr1lem  23677  kqreglem1  23679  kqreglem2  23680