Theorem cnt0 22497

Description: The preimage of a T₀ topology under an injective map is T₀. (Contributed by Mario Carneiro, 25-Aug-2015.)

Assertion

Ref	Expression
cnt0	⊢ ((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐽 ∈ Kol2)

Proof of Theorem cnt0

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

Step	Hyp	Ref	Expression
1		cntop1 22391	. . 3 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
2	1	3ad2ant3 1134	. 2 ⊢ ((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐽 ∈ Top)
3		simpl3 1192	. . . . . . . . 9 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝐹 ∈ (𝐽 Cn 𝐾))
4		cnima 22416	. . . . . . . . 9 ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝑤 ∈ 𝐾) → (◡𝐹 “ 𝑤) ∈ 𝐽)
5	3, 4	sylan 580	. . . . . . . 8 ⊢ ((((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) ∧ 𝑤 ∈ 𝐾) → (◡𝐹 “ 𝑤) ∈ 𝐽)
6		eleq2 2827	. . . . . . . . . 10 ⊢ (𝑧 = (◡𝐹 “ 𝑤) → (𝑥 ∈ 𝑧 ↔ 𝑥 ∈ (◡𝐹 “ 𝑤)))
7		eleq2 2827	. . . . . . . . . 10 ⊢ (𝑧 = (◡𝐹 “ 𝑤) → (𝑦 ∈ 𝑧 ↔ 𝑦 ∈ (◡𝐹 “ 𝑤)))
8	6, 7	bibi12d 346	. . . . . . . . 9 ⊢ (𝑧 = (◡𝐹 “ 𝑤) → ((𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) ↔ (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ 𝑦 ∈ (◡𝐹 “ 𝑤))))
9	8	rspcv 3557	. . . . . . . 8 ⊢ ((◡𝐹 “ 𝑤) ∈ 𝐽 → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ 𝑦 ∈ (◡𝐹 “ 𝑤))))
10	5, 9	syl 17	. . . . . . 7 ⊢ ((((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) ∧ 𝑤 ∈ 𝐾) → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ 𝑦 ∈ (◡𝐹 “ 𝑤))))
11		simprl 768	. . . . . . . . . 10 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝑥 ∈ ∪ 𝐽)
12		eqid 2738	. . . . . . . . . . . . . 14 ⊢ ∪ 𝐽 = ∪ 𝐽
13		eqid 2738	. . . . . . . . . . . . . 14 ⊢ ∪ 𝐾 = ∪ 𝐾
14	12, 13	cnf 22397	. . . . . . . . . . . . 13 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹:∪ 𝐽⟶∪ 𝐾)
15	3, 14	syl 17	. . . . . . . . . . . 12 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝐹:∪ 𝐽⟶∪ 𝐾)
16	15	ffnd 6601	. . . . . . . . . . 11 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝐹 Fn ∪ 𝐽)
17		elpreima 6935	. . . . . . . . . . 11 ⊢ (𝐹 Fn ∪ 𝐽 → (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ (𝑥 ∈ ∪ 𝐽 ∧ (𝐹‘𝑥) ∈ 𝑤)))
18	16, 17	syl 17	. . . . . . . . . 10 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ (𝑥 ∈ ∪ 𝐽 ∧ (𝐹‘𝑥) ∈ 𝑤)))
19	11, 18	mpbirand 704	. . . . . . . . 9 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝑥 ∈ (◡𝐹 “ 𝑤) ↔ (𝐹‘𝑥) ∈ 𝑤))
20		simprr 770	. . . . . . . . . 10 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝑦 ∈ ∪ 𝐽)
21		elpreima 6935	. . . . . . . . . . 11 ⊢ (𝐹 Fn ∪ 𝐽 → (𝑦 ∈ (◡𝐹 “ 𝑤) ↔ (𝑦 ∈ ∪ 𝐽 ∧ (𝐹‘𝑦) ∈ 𝑤)))
22	16, 21	syl 17	. . . . . . . . . 10 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝑦 ∈ (◡𝐹 “ 𝑤) ↔ (𝑦 ∈ ∪ 𝐽 ∧ (𝐹‘𝑦) ∈ 𝑤)))
23	20, 22	mpbirand 704	. . . . . . . . 9 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝑦 ∈ (◡𝐹 “ 𝑤) ↔ (𝐹‘𝑦) ∈ 𝑤))
24	19, 23	bibi12d 346	. . . . . . . 8 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → ((𝑥 ∈ (◡𝐹 “ 𝑤) ↔ 𝑦 ∈ (◡𝐹 “ 𝑤)) ↔ ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤)))
25	24	adantr 481	. . . . . . 7 ⊢ ((((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) ∧ 𝑤 ∈ 𝐾) → ((𝑥 ∈ (◡𝐹 “ 𝑤) ↔ 𝑦 ∈ (◡𝐹 “ 𝑤)) ↔ ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤)))
26	10, 25	sylibd 238	. . . . . 6 ⊢ ((((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) ∧ 𝑤 ∈ 𝐾) → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤)))
27	26	ralrimdva 3106	. . . . 5 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → ∀𝑤 ∈ 𝐾 ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤)))
28		simpl1 1190	. . . . . 6 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝐾 ∈ Kol2)
29	15, 11	ffvelrnd 6962	. . . . . 6 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝐹‘𝑥) ∈ ∪ 𝐾)
30	15, 20	ffvelrnd 6962	. . . . . 6 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (𝐹‘𝑦) ∈ ∪ 𝐾)
31	13	t0sep 22475	. . . . . 6 ⊢ ((𝐾 ∈ Kol2 ∧ ((𝐹‘𝑥) ∈ ∪ 𝐾 ∧ (𝐹‘𝑦) ∈ ∪ 𝐾)) → (∀𝑤 ∈ 𝐾 ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤) → (𝐹‘𝑥) = (𝐹‘𝑦)))
32	28, 29, 30, 31	syl12anc 834	. . . . 5 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (∀𝑤 ∈ 𝐾 ((𝐹‘𝑥) ∈ 𝑤 ↔ (𝐹‘𝑦) ∈ 𝑤) → (𝐹‘𝑥) = (𝐹‘𝑦)))
33	27, 32	syld 47	. . . 4 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → (𝐹‘𝑥) = (𝐹‘𝑦)))
34		simpl2 1191	. . . . 5 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝐹:𝑋–1-1→𝑌)
35	15	fdmd 6611	. . . . . . 7 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → dom 𝐹 = ∪ 𝐽)
36		f1dm 6674	. . . . . . . 8 ⊢ (𝐹:𝑋–1-1→𝑌 → dom 𝐹 = 𝑋)
37	34, 36	syl 17	. . . . . . 7 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → dom 𝐹 = 𝑋)
38	35, 37	eqtr3d 2780	. . . . . 6 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → ∪ 𝐽 = 𝑋)
39	11, 38	eleqtrd 2841	. . . . 5 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝑥 ∈ 𝑋)
40	20, 38	eleqtrd 2841	. . . . 5 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → 𝑦 ∈ 𝑋)
41		f1fveq 7135	. . . . 5 ⊢ ((𝐹:𝑋–1-1→𝑌 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝐹‘𝑥) = (𝐹‘𝑦) ↔ 𝑥 = 𝑦))
42	34, 39, 40, 41	syl12anc 834	. . . 4 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → ((𝐹‘𝑥) = (𝐹‘𝑦) ↔ 𝑥 = 𝑦))
43	33, 42	sylibd 238	. . 3 ⊢ (((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ (𝑥 ∈ ∪ 𝐽 ∧ 𝑦 ∈ ∪ 𝐽)) → (∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → 𝑥 = 𝑦))
44	43	ralrimivva 3123	. 2 ⊢ ((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → ∀𝑥 ∈ ∪ 𝐽∀𝑦 ∈ ∪ 𝐽(∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → 𝑥 = 𝑦))
45	12	ist0 22471	. 2 ⊢ (𝐽 ∈ Kol2 ↔ (𝐽 ∈ Top ∧ ∀𝑥 ∈ ∪ 𝐽∀𝑦 ∈ ∪ 𝐽(∀𝑧 ∈ 𝐽 (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧) → 𝑥 = 𝑦)))
46	2, 44, 45	sylanbrc 583	1 ⊢ ((𝐾 ∈ Kol2 ∧ 𝐹:𝑋–1-1→𝑌 ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐽 ∈ Kol2)

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   ∧ w3a 1086   = wceq 1539   ∈ wcel 2106  ∀wral 3064  ∪ cuni 4839  ^◡ccnv 5588  dom cdm 5589   “ cima 5592   Fn wfn 6428  ⟶wf 6429  –1-1→wf1 6430  ‘cfv 6433  (class class class)co 7275  Topctop 22042   Cn ccn 22375  Kol2ct0 22457

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-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-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-sbc 3717  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-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-fv 6441  df-ov 7278  df-oprab 7279  df-mpo 7280  df-map 8617  df-top 22043  df-topon 22060  df-cn 22378  df-t0 22464

This theorem is referenced by:  restt0  22517  sst0  22524  t0hmph  22941