hausgraph - Mathbox for Stefan O'Rear

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Theorem hausgraph 43960

Description: The graph of a continuous function into a Hausdorff space is closed. (Contributed by Stefan O'Rear, 25-Jan-2015.)

**Assertion**
Ref	Expression
hausgraph	⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐹 ∈ (Clsd‘(𝐽 ×_t 𝐾)))

Proof of Theorem hausgraph Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		f1stres 8006	. . . . . . . . 9 ⊢ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐽
2		ffn 6705	. . . . . . . . 9 ⊢ ((1^st ↾ (∪ 𝐽 × ∪ 𝐾)):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐽 → (1^st ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾))
3	1, 2	ax-mp 5	. . . . . . . 8 ⊢ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾)
4		fvco2 6978	. . . . . . . 8 ⊢ (((1^st ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = (𝐹‘((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)))
5	3, 4	mpan 702	. . . . . . 7 ⊢ (𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) → ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = (𝐹‘((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)))
6	5	adantl 486	. . . . . 6 ⊢ (((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = (𝐹‘((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)))
7		fvres 6900	. . . . . . . 8 ⊢ (𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) → ((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎) = (1^st ‘𝑎))
8	7	fveq2d 6885	. . . . . . 7 ⊢ (𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) → (𝐹‘((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)) = (𝐹‘(1^st ‘𝑎)))
9	8	adantl 486	. . . . . 6 ⊢ (((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → (𝐹‘((1^st ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)) = (𝐹‘(1^st ‘𝑎)))
10	6, 9	eqtrd 2798	. . . . 5 ⊢ (((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = (𝐹‘(1^st ‘𝑎)))
11		fvres 6900	. . . . . 6 ⊢ (𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) → ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎) = (2^nd ‘𝑎))
12	11	adantl 486	. . . . 5 ⊢ (((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎) = (2^nd ‘𝑎))
13	10, 12	eqeq12d 2779	. . . 4 ⊢ (((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) ∧ 𝑎 ∈ (∪ 𝐽 × ∪ 𝐾)) → (((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎) ↔ (𝐹‘(1^st ‘𝑎)) = (2^nd ‘𝑎)))
14	13	rabbidva 3422	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)} = {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ (𝐹‘(1^st ‘𝑎)) = (2^nd ‘𝑎)})
15		eqid 2763	. . . . . . . 8 ⊢ ∪ 𝐽 = ∪ 𝐽
16		eqid 2763	. . . . . . . 8 ⊢ ∪ 𝐾 = ∪ 𝐾
17	15, 16	cnf 23412	. . . . . . 7 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹:∪ 𝐽⟶∪ 𝐾)
18	17	adantl 486	. . . . . 6 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐹:∪ 𝐽⟶∪ 𝐾)
19		fco 6730	. . . . . 6 ⊢ ((𝐹:∪ 𝐽⟶∪ 𝐾 ∧ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐽) → (𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐾)
20	18, 1, 19	sylancl 597	. . . . 5 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐾)
21	20	ffnd 6706	. . . 4 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) Fn (∪ 𝐽 × ∪ 𝐾))
22		f2ndres 8007	. . . . 5 ⊢ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐾
23		ffn 6705	. . . . 5 ⊢ ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾)):(∪ 𝐽 × ∪ 𝐾)⟶∪ 𝐾 → (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾))
24	22, 23	ax-mp 5	. . . 4 ⊢ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾)
25		fndmin 7040	. . . 4 ⊢ (((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) Fn (∪ 𝐽 × ∪ 𝐾) ∧ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)) Fn (∪ 𝐽 × ∪ 𝐾)) → dom ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∩ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾))) = {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)})
26	21, 24, 25	sylancl 597	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → dom ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∩ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾))) = {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾)))‘𝑎) = ((2^nd ↾ (∪ 𝐽 × ∪ 𝐾))‘𝑎)})
27		fgraphxp 43959	. . . 4 ⊢ (𝐹:∪ 𝐽⟶∪ 𝐾 → 𝐹 = {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ (𝐹‘(1^st ‘𝑎)) = (2^nd ‘𝑎)})
28	18, 27	syl 18	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐹 = {𝑎 ∈ (∪ 𝐽 × ∪ 𝐾) ∣ (𝐹‘(1^st ‘𝑎)) = (2^nd ‘𝑎)})
29	14, 26, 28	3eqtr4rd 2809	. 2 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐹 = dom ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∩ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾))))
30		simpl 487	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐾 ∈ Haus)
31		cntop1 23406	. . . . . . 7 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
32	31	adantl 486	. . . . . 6 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐽 ∈ Top)
33	15	toptopon 23083	. . . . . 6 ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽))
34	32, 33	sylib 221	. . . . 5 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐽 ∈ (TopOn‘∪ 𝐽))
35		haustop 23497	. . . . . . 7 ⊢ (𝐾 ∈ Haus → 𝐾 ∈ Top)
36	30, 35	syl 18	. . . . . 6 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐾 ∈ Top)
37	16	toptopon 23083	. . . . . 6 ⊢ (𝐾 ∈ Top ↔ 𝐾 ∈ (TopOn‘∪ 𝐾))
38	36, 37	sylib 221	. . . . 5 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐾 ∈ (TopOn‘∪ 𝐾))
39		tx1cn 23775	. . . . 5 ⊢ ((𝐽 ∈ (TopOn‘∪ 𝐽) ∧ 𝐾 ∈ (TopOn‘∪ 𝐾)) → (1^st ↾ (∪ 𝐽 × ∪ 𝐾)) ∈ ((𝐽 ×_t 𝐾) Cn 𝐽))
40	34, 38, 39	syl2anc 595	. . . 4 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (1^st ↾ (∪ 𝐽 × ∪ 𝐾)) ∈ ((𝐽 ×_t 𝐾) Cn 𝐽))
41		cnco 23432	. . . 4 ⊢ (((1^st ↾ (∪ 𝐽 × ∪ 𝐾)) ∈ ((𝐽 ×_t 𝐾) Cn 𝐽) ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∈ ((𝐽 ×_t 𝐾) Cn 𝐾))
42	40, 41	sylancom 599	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∈ ((𝐽 ×_t 𝐾) Cn 𝐾))
43		tx2cn 23776	. . . 4 ⊢ ((𝐽 ∈ (TopOn‘∪ 𝐽) ∧ 𝐾 ∈ (TopOn‘∪ 𝐾)) → (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)) ∈ ((𝐽 ×_t 𝐾) Cn 𝐾))
44	34, 38, 43	syl2anc 595	. . 3 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (2^nd ↾ (∪ 𝐽 × ∪ 𝐾)) ∈ ((𝐽 ×_t 𝐾) Cn 𝐾))
45	30, 42, 44	hauseqlcld 23812	. 2 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → dom ((𝐹 ∘ (1^st ↾ (∪ 𝐽 × ∪ 𝐾))) ∩ (2^nd ↾ (∪ 𝐽 × ∪ 𝐾))) ∈ (Clsd‘(𝐽 ×_t 𝐾)))
46	29, 45	eqeltrd 2863	1 ⊢ ((𝐾 ∈ Haus ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → 𝐹 ∈ (Clsd‘(𝐽 ×_t 𝐾)))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ∧ wa 400 = wceq 1570 ∈ wcel 2143 {crab 3416 ∩ cin 3904 ∪ cuni 4872 × cxp 5659 dom cdm 5661 ↾ cres 5663 ∘ ccom 5665 Fn wfn 6531 ⟶wf 6532 ‘cfv 6536 (class class class)co 7410 1^st c1st 7980 2^nd c2nd 7981 Topctop 23059 TopOnctopon 23076 Clsdccld 23182 Cn ccn 23390 Hauscha 23474 ×_t ctx 23726

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732

This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-1st 7982 df-2nd 7983 df-map 8822 df-topgen 17500 df-top 23060 df-topon 23077 df-bases 23112 df-cld 23185 df-cn 23393 df-haus 23481 df-tx 23728

This theorem is used by: (None)

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