kelac1 - Mathbox for Stefan O'Rear

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Theorem kelac1 36651

Description: Kelley's choice, basic form: if a collection of sets can be cast as closed sets in the factors of a topology, and there is a definable element in each topology (which need not be in the closed set - if it were this would be trivial), then compactness (via finite intersection) guarantees that the final product is nonempty. (Contributed by Stefan O'Rear, 22-Feb-2015.)

**Hypotheses**
Ref	Expression
kelac1.z	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑆 ≠ ∅)
kelac1.j	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐽 ∈ Top)
kelac1.c	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐶 ∈ (Clsd‘𝐽))
kelac1.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐵:𝑆–1-1-onto→𝐶)
kelac1.u	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑈 ∈ ∪ 𝐽)
kelac1.k	⊢ (𝜑 → (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Comp)

**Assertion**
Ref	Expression
kelac1	⊢ (𝜑 → X𝑥 ∈ 𝐼 𝑆 ≠ ∅)

Distinct variable groups: 𝜑,𝑥 𝑥,𝐼 Allowed substitution hints: 𝐵(𝑥) 𝐶(𝑥) 𝑆(𝑥) 𝑈(𝑥) 𝐽(𝑥)

Proof of Theorem kelac1 Dummy variables 𝑓 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		kelac1.c	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐶 ∈ (Clsd‘𝐽))
2		eqid 2610	. . . . . . . 8 ⊢ ∪ 𝐽 = ∪ 𝐽
3	2	cldss 20643	. . . . . . 7 ⊢ (𝐶 ∈ (Clsd‘𝐽) → 𝐶 ⊆ ∪ 𝐽)
4	1, 3	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐶 ⊆ ∪ 𝐽)
5	4	ralrimiva 2949	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝐶 ⊆ ∪ 𝐽)
6		boxriin 7836	. . . . 5 ⊢ (∀𝑥 ∈ 𝐼 𝐶 ⊆ ∪ 𝐽 → X𝑥 ∈ 𝐼 𝐶 = (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
7	5, 6	syl 17	. . . 4 ⊢ (𝜑 → X𝑥 ∈ 𝐼 𝐶 = (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
8		kelac1.k	. . . . . . . . 9 ⊢ (𝜑 → (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Comp)
9		cmptop 21008	. . . . . . . . 9 ⊢ ((∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Comp → (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Top)
10		0ntop 20535	. . . . . . . . . . 11 ⊢ ¬ ∅ ∈ Top
11		fvprc 6097	. . . . . . . . . . . 12 ⊢ (¬ (𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V → (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) = ∅)
12	11	eleq1d 2672	. . . . . . . . . . 11 ⊢ (¬ (𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V → ((∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Top ↔ ∅ ∈ Top))
13	10, 12	mtbiri 316	. . . . . . . . . 10 ⊢ (¬ (𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V → ¬ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Top)
14	13	con4i 112	. . . . . . . . 9 ⊢ ((∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∈ Top → (𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V)
15	8, 9, 14	3syl 18	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V)
16		kelac1.j	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐽 ∈ Top)
17		eqid 2610	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐼 ↦ 𝐽) = (𝑥 ∈ 𝐼 ↦ 𝐽)
18	16, 17	fmptd 6292	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝐽):𝐼⟶Top)
19		dmfex 7017	. . . . . . . 8 ⊢ (((𝑥 ∈ 𝐼 ↦ 𝐽) ∈ V ∧ (𝑥 ∈ 𝐼 ↦ 𝐽):𝐼⟶Top) → 𝐼 ∈ V)
20	15, 18, 19	syl2anc 691	. . . . . . 7 ⊢ (𝜑 → 𝐼 ∈ V)
21	16	ralrimiva 2949	. . . . . . 7 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝐽 ∈ Top)
22		eqid 2610	. . . . . . . 8 ⊢ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) = (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽))
23	22	ptunimpt 21208	. . . . . . 7 ⊢ ((𝐼 ∈ V ∧ ∀𝑥 ∈ 𝐼 𝐽 ∈ Top) → X𝑥 ∈ 𝐼 ∪ 𝐽 = ∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)))
24	20, 21, 23	syl2anc 691	. . . . . 6 ⊢ (𝜑 → X𝑥 ∈ 𝐼 ∪ 𝐽 = ∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)))
25	24	ineq1d 3775	. . . . 5 ⊢ (𝜑 → (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) = (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
26		eqid 2610	. . . . . 6 ⊢ ∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) = ∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽))
27	2	topcld 20649	. . . . . . . . . 10 ⊢ (𝐽 ∈ Top → ∪ 𝐽 ∈ (Clsd‘𝐽))
28	16, 27	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ∪ 𝐽 ∈ (Clsd‘𝐽))
29	1, 28	ifcld 4081	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ∈ (Clsd‘𝐽))
30	20, 16, 29	ptcldmpt 21227	. . . . . . 7 ⊢ (𝜑 → X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ∈ (Clsd‘(∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽))))
31	30	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐼) → X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ∈ (Clsd‘(∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽))))
32		simprr 792	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → 𝑧 ∈ Fin)
33		kelac1.b	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐵:𝑆–1-1-onto→𝐶)
34		f1ofo 6057	. . . . . . . . . . . . . . 15 ⊢ (𝐵:𝑆–1-1-onto→𝐶 → 𝐵:𝑆–onto→𝐶)
35		foima 6033	. . . . . . . . . . . . . . 15 ⊢ (𝐵:𝑆–onto→𝐶 → (𝐵 “ 𝑆) = 𝐶)
36	33, 34, 35	3syl 18	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝐵 “ 𝑆) = 𝐶)
37	36	eqcomd 2616	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐶 = (𝐵 “ 𝑆))
38		kelac1.z	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑆 ≠ ∅)
39		f1ofn 6051	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵:𝑆–1-1-onto→𝐶 → 𝐵 Fn 𝑆)
40	33, 39	syl 17	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐵 Fn 𝑆)
41		ssid 3587	. . . . . . . . . . . . . . . 16 ⊢ 𝑆 ⊆ 𝑆
42		fnimaeq0 5926	. . . . . . . . . . . . . . . 16 ⊢ ((𝐵 Fn 𝑆 ∧ 𝑆 ⊆ 𝑆) → ((𝐵 “ 𝑆) = ∅ ↔ 𝑆 = ∅))
43	40, 41, 42	sylancl 693	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝐵 “ 𝑆) = ∅ ↔ 𝑆 = ∅))
44	43	necon3bid 2826	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝐵 “ 𝑆) ≠ ∅ ↔ 𝑆 ≠ ∅))
45	38, 44	mpbird 246	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝐵 “ 𝑆) ≠ ∅)
46	37, 45	eqnetrd 2849	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐶 ≠ ∅)
47		n0 3890	. . . . . . . . . . . 12 ⊢ (𝐶 ≠ ∅ ↔ ∃𝑤 𝑤 ∈ 𝐶)
48	46, 47	sylib 207	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ∃𝑤 𝑤 ∈ 𝐶)
49		rexv 3193	. . . . . . . . . . 11 ⊢ (∃𝑤 ∈ V 𝑤 ∈ 𝐶 ↔ ∃𝑤 𝑤 ∈ 𝐶)
50	48, 49	sylibr 223	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ∃𝑤 ∈ V 𝑤 ∈ 𝐶)
51	50	ralrimiva 2949	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 ∃𝑤 ∈ V 𝑤 ∈ 𝐶)
52		ssralv 3629	. . . . . . . . . 10 ⊢ (𝑧 ⊆ 𝐼 → (∀𝑥 ∈ 𝐼 ∃𝑤 ∈ V 𝑤 ∈ 𝐶 → ∀𝑥 ∈ 𝑧 ∃𝑤 ∈ V 𝑤 ∈ 𝐶))
53	52	adantr 480	. . . . . . . . 9 ⊢ ((𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin) → (∀𝑥 ∈ 𝐼 ∃𝑤 ∈ V 𝑤 ∈ 𝐶 → ∀𝑥 ∈ 𝑧 ∃𝑤 ∈ V 𝑤 ∈ 𝐶))
54	51, 53	mpan9 485	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → ∀𝑥 ∈ 𝑧 ∃𝑤 ∈ V 𝑤 ∈ 𝐶)
55		eleq1 2676	. . . . . . . . 9 ⊢ (𝑤 = (𝑓‘𝑥) → (𝑤 ∈ 𝐶 ↔ (𝑓‘𝑥) ∈ 𝐶))
56	55	ac6sfi 8089	. . . . . . . 8 ⊢ ((𝑧 ∈ Fin ∧ ∀𝑥 ∈ 𝑧 ∃𝑤 ∈ V 𝑤 ∈ 𝐶) → ∃𝑓(𝑓:𝑧⟶V ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶))
57	32, 54, 56	syl2anc 691	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → ∃𝑓(𝑓:𝑧⟶V ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶))
58	24	eqcomd 2616	. . . . . . . . . . 11 ⊢ (𝜑 → ∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) = X𝑥 ∈ 𝐼 ∪ 𝐽)
59	58	ineq1d 3775	. . . . . . . . . 10 ⊢ (𝜑 → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) = (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
60	59	ad2antrr 758	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) = (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
61		iftrue 4042	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ 𝑧 → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) = (𝑓‘𝑥))
62	61	ad2antrl 760	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) = (𝑓‘𝑥))
63		simpll 786	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → 𝜑)
64		simprl 790	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → 𝑧 ⊆ 𝐼)
65	64	sselda 3568	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → 𝑥 ∈ 𝐼)
66	63, 65, 4	syl2anc 691	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → 𝐶 ⊆ ∪ 𝐽)
67	66	sseld 3567	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → ((𝑓‘𝑥) ∈ 𝐶 → (𝑓‘𝑥) ∈ ∪ 𝐽))
68	67	impr 647	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) → (𝑓‘𝑥) ∈ ∪ 𝐽)
69	62, 68	eqeltrd 2688	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
70	69	expr 641	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → ((𝑓‘𝑥) ∈ 𝐶 → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
71	70	ralimdva 2945	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶 → ∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
72	71	imp 444	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
73		eldifn 3695	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ (𝐼 ∖ 𝑧) → ¬ 𝑥 ∈ 𝑧)
74	73	iffalsed 4047	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ (𝐼 ∖ 𝑧) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) = 𝑈)
75	74	adantl 481	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) = 𝑈)
76		eldifi 3694	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ (𝐼 ∖ 𝑧) → 𝑥 ∈ 𝐼)
77		kelac1.u	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑈 ∈ ∪ 𝐽)
78	76, 77	sylan2 490	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → 𝑈 ∈ ∪ 𝐽)
79	75, 78	eqeltrd 2688	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
80	79	ralrimiva 2949	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
81	80	ad2antrr 758	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
82		ralun 3757	. . . . . . . . . . . . . 14 ⊢ ((∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽 ∧ ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽) → ∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
83	72, 81, 82	syl2anc 691	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
84		undif 4001	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ⊆ 𝐼 ↔ (𝑧 ∪ (𝐼 ∖ 𝑧)) = 𝐼)
85	84	biimpi 205	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 ⊆ 𝐼 → (𝑧 ∪ (𝐼 ∖ 𝑧)) = 𝐼)
86	85	ad2antrl 760	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (𝑧 ∪ (𝐼 ∖ 𝑧)) = 𝐼)
87	86	raleqdv 3121	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽 ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
88	87	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽 ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
89	83, 88	mpbid 221	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽)
90	20	ad2antrr 758	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → 𝐼 ∈ V)
91		mptelixpg 7831	. . . . . . . . . . . . 13 ⊢ (𝐼 ∈ V → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 ∪ 𝐽 ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
92	90, 91	syl 17	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 ∪ 𝐽 ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ ∪ 𝐽))
93	89, 92	mpbird 246	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 ∪ 𝐽)
94		eleq2 2677	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝐶 = if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) → ((𝑓‘𝑥) ∈ 𝐶 ↔ (𝑓‘𝑥) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
95		eleq2 2677	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (∪ 𝐽 = if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) → ((𝑓‘𝑥) ∈ ∪ 𝐽 ↔ (𝑓‘𝑥) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
96		simplrr 797	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) ∧ 𝑥 = 𝑦) → (𝑓‘𝑥) ∈ 𝐶)
97	68	adantr 480	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) ∧ ¬ 𝑥 = 𝑦) → (𝑓‘𝑥) ∈ ∪ 𝐽)
98	94, 95, 96, 97	ifbothda 4073	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) → (𝑓‘𝑥) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
99	62, 98	eqeltrd 2688	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑥 ∈ 𝑧 ∧ (𝑓‘𝑥) ∈ 𝐶)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
100	99	expr 641	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑥 ∈ 𝑧) → ((𝑓‘𝑥) ∈ 𝐶 → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
101	100	ralimdva 2945	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶 → ∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
102	101	imp 444	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
103	102	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
104	78	adantlr 747	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → 𝑈 ∈ ∪ 𝐽)
105	74	adantl 481	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) = 𝑈)
106		incom 3767	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝐼 ∖ 𝑧) ∩ 𝑧) = (𝑧 ∩ (𝐼 ∖ 𝑧))
107		disjdif 3992	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑧 ∩ (𝐼 ∖ 𝑧)) = ∅
108	106, 107	eqtri 2632	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝐼 ∖ 𝑧) ∩ 𝑧) = ∅
109	108	a1i 11	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → ((𝐼 ∖ 𝑧) ∩ 𝑧) = ∅)
110		simpr 476	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → 𝑥 ∈ (𝐼 ∖ 𝑧))
111		simplr 788	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → 𝑦 ∈ 𝑧)
112		disjne 3974	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((((𝐼 ∖ 𝑧) ∩ 𝑧) = ∅ ∧ 𝑥 ∈ (𝐼 ∖ 𝑧) ∧ 𝑦 ∈ 𝑧) → 𝑥 ≠ 𝑦)
113	109, 110, 111, 112	syl3anc 1318	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → 𝑥 ≠ 𝑦)
114	113	neneqd 2787	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → ¬ 𝑥 = 𝑦)
115	114	iffalsed 4047	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) = ∪ 𝐽)
116	104, 105, 115	3eltr4d 2703	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝑧) ∧ 𝑥 ∈ (𝐼 ∖ 𝑧)) → if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
117	116	ralrimiva 2949	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
118	117	adantlr 747	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
119	118	adantlr 747	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
120		ralun 3757	. . . . . . . . . . . . . . . 16 ⊢ ((∀𝑥 ∈ 𝑧 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ∧ ∀𝑥 ∈ (𝐼 ∖ 𝑧)if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) → ∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
121	103, 119, 120	syl2anc 691	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
122	86	raleqdv 3121	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
123	122	ad2antrr 758	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → (∀𝑥 ∈ (𝑧 ∪ (𝐼 ∖ 𝑧))if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
124	121, 123	mpbid 221	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
125	20	ad3antrrr 762	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → 𝐼 ∈ V)
126		mptelixpg 7831	. . . . . . . . . . . . . . 15 ⊢ (𝐼 ∈ V → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
127	125, 126	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑥 ∈ 𝐼 if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈) ∈ if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
128	124, 127	mpbird 246	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) ∧ 𝑦 ∈ 𝑧) → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
129	128	ralrimiva 2949	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ∀𝑦 ∈ 𝑧 (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
130		mptexg 6389	. . . . . . . . . . . . . . 15 ⊢ (𝐼 ∈ V → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ V)
131	20, 130	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ V)
132	131	ad2antrr 758	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ V)
133		eliin 4461	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ V → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑦 ∈ 𝑧 (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
134	132, 133	syl 17	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽) ↔ ∀𝑦 ∈ 𝑧 (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
135	129, 134	mpbird 246	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽))
136	93, 135	elind 3760	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)))
137		ne0i 3880	. . . . . . . . . 10 ⊢ ((𝑥 ∈ 𝐼 ↦ if(𝑥 ∈ 𝑧, (𝑓‘𝑥), 𝑈)) ∈ (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) → (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
138	136, 137	syl 17	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
139	60, 138	eqnetrd 2849	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶) → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
140	139	adantrl 748	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) ∧ (𝑓:𝑧⟶V ∧ ∀𝑥 ∈ 𝑧 (𝑓‘𝑥) ∈ 𝐶)) → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
141	57, 140	exlimddv 1850	. . . . . 6 ⊢ ((𝜑 ∧ (𝑧 ⊆ 𝐼 ∧ 𝑧 ∈ Fin)) → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝑧 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
142	26, 8, 31, 141	cmpfiiin 36278	. . . . 5 ⊢ (𝜑 → (∪ (∏_t‘(𝑥 ∈ 𝐼 ↦ 𝐽)) ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
143	25, 142	eqnetrd 2849	. . . 4 ⊢ (𝜑 → (X𝑥 ∈ 𝐼 ∪ 𝐽 ∩ ∩ 𝑦 ∈ 𝐼 X𝑥 ∈ 𝐼 if(𝑥 = 𝑦, 𝐶, ∪ 𝐽)) ≠ ∅)
144	7, 143	eqnetrd 2849	. . 3 ⊢ (𝜑 → X𝑥 ∈ 𝐼 𝐶 ≠ ∅)
145		n0 3890	. . 3 ⊢ (X𝑥 ∈ 𝐼 𝐶 ≠ ∅ ↔ ∃𝑦 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶)
146	144, 145	sylib 207	. 2 ⊢ (𝜑 → ∃𝑦 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶)
147		elixp2 7798	. . . . . 6 ⊢ (𝑦 ∈ X𝑥 ∈ 𝐼 𝐶 ↔ (𝑦 ∈ V ∧ 𝑦 Fn 𝐼 ∧ ∀𝑥 ∈ 𝐼 (𝑦‘𝑥) ∈ 𝐶))
148	147	simp3bi 1071	. . . . 5 ⊢ (𝑦 ∈ X𝑥 ∈ 𝐼 𝐶 → ∀𝑥 ∈ 𝐼 (𝑦‘𝑥) ∈ 𝐶)
149		f1ocnv 6062	. . . . . . . 8 ⊢ (𝐵:𝑆–1-1-onto→𝐶 → ^◡𝐵:𝐶–1-1-onto→𝑆)
150		f1of 6050	. . . . . . . 8 ⊢ (^◡𝐵:𝐶–1-1-onto→𝑆 → ^◡𝐵:𝐶⟶𝑆)
151		ffvelrn 6265	. . . . . . . . 9 ⊢ ((^◡𝐵:𝐶⟶𝑆 ∧ (𝑦‘𝑥) ∈ 𝐶) → (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆)
152	151	ex 449	. . . . . . . 8 ⊢ (^◡𝐵:𝐶⟶𝑆 → ((𝑦‘𝑥) ∈ 𝐶 → (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
153	33, 149, 150, 152	4syl 19	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝑦‘𝑥) ∈ 𝐶 → (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
154	153	ralimdva 2945	. . . . . 6 ⊢ (𝜑 → (∀𝑥 ∈ 𝐼 (𝑦‘𝑥) ∈ 𝐶 → ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
155	154	imp 444	. . . . 5 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐼 (𝑦‘𝑥) ∈ 𝐶) → ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆)
156	148, 155	sylan2 490	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶) → ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆)
157		mptelixpg 7831	. . . . . 6 ⊢ (𝐼 ∈ V → ((𝑥 ∈ 𝐼 ↦ (^◡𝐵‘(𝑦‘𝑥))) ∈ X𝑥 ∈ 𝐼 𝑆 ↔ ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
158	20, 157	syl 17	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ (^◡𝐵‘(𝑦‘𝑥))) ∈ X𝑥 ∈ 𝐼 𝑆 ↔ ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
159	158	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶) → ((𝑥 ∈ 𝐼 ↦ (^◡𝐵‘(𝑦‘𝑥))) ∈ X𝑥 ∈ 𝐼 𝑆 ↔ ∀𝑥 ∈ 𝐼 (^◡𝐵‘(𝑦‘𝑥)) ∈ 𝑆))
160	156, 159	mpbird 246	. . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶) → (𝑥 ∈ 𝐼 ↦ (^◡𝐵‘(𝑦‘𝑥))) ∈ X𝑥 ∈ 𝐼 𝑆)
161		ne0i 3880	. . 3 ⊢ ((𝑥 ∈ 𝐼 ↦ (^◡𝐵‘(𝑦‘𝑥))) ∈ X𝑥 ∈ 𝐼 𝑆 → X𝑥 ∈ 𝐼 𝑆 ≠ ∅)
162	160, 161	syl 17	. 2 ⊢ ((𝜑 ∧ 𝑦 ∈ X𝑥 ∈ 𝐼 𝐶) → X𝑥 ∈ 𝐼 𝑆 ≠ ∅)
163	146, 162	exlimddv 1850	1 ⊢ (𝜑 → X𝑥 ∈ 𝐼 𝑆 ≠ ∅)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ∃wex 1695 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 Vcvv 3173 ∖ cdif 3537 ∪ cun 3538 ∩ cin 3539 ⊆ wss 3540 ∅c0 3874 ifcif 4036 ∪ cuni 4372 ∩ ciin 4456 ↦ cmpt 4643 ^◡ccnv 5037 “ cima 5041 Fn wfn 5799 ⟶wf 5800 –onto→wfo 5802 –1-1-onto→wf1o 5803 ‘cfv 5804 Xcixp 7794 Fincfn 7841 ∏_tcpt 15922 Topctop 20517 Clsdccld 20630 Compccmp 20999

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-iin 4458 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-2o 7448 df-oadd 7451 df-er 7629 df-map 7746 df-ixp 7795 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-fi 8200 df-topgen 15927 df-pt 15928 df-top 20521 df-bases 20522 df-cld 20633 df-cmp 21000

This theorem is referenced by: kelac2 36653

W3C validator