Theorem 2ndresdju 33291

Description: The 2^nd function restricted to a disjoint union is injective. (Contributed by Thierry Arnoux, 23-Jun-2024.)

Hypotheses

Ref	Expression
2ndresdju.u	⊢ 𝑈 = ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶)
2ndresdju.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)
2ndresdju.x	⊢ (𝜑 → 𝑋 ∈ 𝑊)
2ndresdju.1	⊢ (𝜑 → Disj 𝑥 ∈ 𝑋 𝐶)
2ndresdju.2	⊢ (𝜑 → ∪ 𝑥 ∈ 𝑋 𝐶 = 𝐴)

Assertion

Ref	Expression
2ndresdju	⊢ (𝜑 → (2nd ↾ 𝑈):𝑈–1-1→𝐴)

Distinct variable groups:   𝑥,𝐴   𝑥,𝑋   𝜑,𝑥

Allowed substitution hints:   𝐶(𝑥)   𝑈(𝑥)   𝑉(𝑥)   𝑊(𝑥)

Proof of Theorem 2ndresdju

Dummy variables 𝑢 𝑐 𝑑 𝑦 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fo2nd 8023	. . . . 5 ⊢ 2nd :V–onto→V
2		fofn 6799	. . . . 5 ⊢ (2nd :V–onto→V → 2nd Fn V)
3	1, 2	mp1i 14	. . . 4 ⊢ (𝜑 → 2nd Fn V)
4		ssv 3932	. . . . 5 ⊢ 𝑈 ⊆ V
5	4	a1i 11	. . . 4 ⊢ (𝜑 → 𝑈 ⊆ V)
6	3, 5	fnssresd 6664	. . 3 ⊢ (𝜑 → (2nd ↾ 𝑈) Fn 𝑈)
7		simpr 490	. . . . . 6 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑈) → 𝑢 ∈ 𝑈)
8	7	fvresd 6906	. . . . 5 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑈) → ((2nd ↾ 𝑈)‘𝑢) = (2nd ‘𝑢))
9		2ndresdju.u	. . . . . . . 8 ⊢ 𝑈 = ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶)
10		djussxp2 33290	. . . . . . . . 9 ⊢ ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶) ⊆ (𝑋 × ∪ 𝑥 ∈ 𝑋 𝐶)
11		2ndresdju.2	. . . . . . . . . 10 ⊢ (𝜑 → ∪ 𝑥 ∈ 𝑋 𝐶 = 𝐴)
12	11	xpeq2d 5680	. . . . . . . . 9 ⊢ (𝜑 → (𝑋 × ∪ 𝑥 ∈ 𝑋 𝐶) = (𝑋 × 𝐴))
13	10, 12	sseqtrid 3950	. . . . . . . 8 ⊢ (𝜑 → ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶) ⊆ (𝑋 × 𝐴))
14	9, 13	eqsstrid 3946	. . . . . . 7 ⊢ (𝜑 → 𝑈 ⊆ (𝑋 × 𝐴))
15	14	sselda 3908	. . . . . 6 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑈) → 𝑢 ∈ (𝑋 × 𝐴))
16		xp2nd 8035	. . . . . 6 ⊢ (𝑢 ∈ (𝑋 × 𝐴) → (2nd ‘𝑢) ∈ 𝐴)
17	15, 16	syl 18	. . . . 5 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑈) → (2nd ‘𝑢) ∈ 𝐴)
18	8, 17	eqeltrd 2860	. . . 4 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑈) → ((2nd ↾ 𝑈)‘𝑢) ∈ 𝐴)
19	18	ralrimiva 3154	. . 3 ⊢ (𝜑 → ∀𝑢 ∈ 𝑈 ((2nd ↾ 𝑈)‘𝑢) ∈ 𝐴)
20		ffnfv 7120	. . 3 ⊢ ((2nd ↾ 𝑈):𝑈⟶𝐴 ↔ ((2nd ↾ 𝑈) Fn 𝑈 ∧ ∀𝑢 ∈ 𝑈 ((2nd ↾ 𝑈)‘𝑢) ∈ 𝐴))
21	6, 19, 20	sylanbrc 595	. 2 ⊢ (𝜑 → (2nd ↾ 𝑈):𝑈⟶𝐴)
22		nfv 1946	. . . . . . . . 9 ⊢ Ⅎ𝑥𝜑
23		nfiu1 4985	. . . . . . . . . . 11 ⊢ Ⅎ𝑥∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶)
24	9, 23	nfcxfr 2920	. . . . . . . . . 10 ⊢ Ⅎ𝑥𝑈
25	24	nfcri 2914	. . . . . . . . 9 ⊢ Ⅎ𝑥 𝑢 ∈ 𝑈
26	22, 25	nfan 1931	. . . . . . . 8 ⊢ Ⅎ𝑥(𝜑 ∧ 𝑢 ∈ 𝑈)
27	24	nfcri 2914	. . . . . . . 8 ⊢ Ⅎ𝑥 𝑣 ∈ 𝑈
28	26, 27	nfan 1931	. . . . . . 7 ⊢ Ⅎ𝑥((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈)
29		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑥2nd
30	29, 24	nfres 5971	. . . . . . . . 9 ⊢ Ⅎ𝑥(2nd ↾ 𝑈)
31		nfcv 2922	. . . . . . . . 9 ⊢ Ⅎ𝑥𝑢
32	30, 31	nffv 6896	. . . . . . . 8 ⊢ Ⅎ𝑥((2nd ↾ 𝑈)‘𝑢)
33		nfcv 2922	. . . . . . . . 9 ⊢ Ⅎ𝑥𝑣
34	30, 33	nffv 6896	. . . . . . . 8 ⊢ Ⅎ𝑥((2nd ↾ 𝑈)‘𝑣)
35	32, 34	nfeq 2935	. . . . . . 7 ⊢ Ⅎ𝑥((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)
36	28, 35	nfan 1931	. . . . . 6 ⊢ Ⅎ𝑥(((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣))
37		nfv 1946	. . . . . 6 ⊢ Ⅎ𝑥 𝑢 = 𝑣
38	9	eleq2i 2852	. . . . . . . 8 ⊢ (𝑢 ∈ 𝑈 ↔ 𝑢 ∈ ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶))
39		eliunxp 5813	. . . . . . . 8 ⊢ (𝑢 ∈ ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶) ↔ ∃𝑥∃𝑐(𝑢 = ⟨𝑥, 𝑐⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)))
40	38, 39	sylbb 222	. . . . . . 7 ⊢ (𝑢 ∈ 𝑈 → ∃𝑥∃𝑐(𝑢 = ⟨𝑥, 𝑐⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)))
41	40	ad3antlr 744	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) → ∃𝑥∃𝑐(𝑢 = ⟨𝑥, 𝑐⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)))
42	9	eleq2i 2852	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ 𝑈 ↔ 𝑣 ∈ ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶))
43		eliunxp 5813	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ ∪ 𝑥 ∈ 𝑋 ({𝑥} × 𝐶) ↔ ∃𝑥∃𝑑(𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶)))
44	42, 43	bitri 278	. . . . . . . . . . . 12 ⊢ (𝑣 ∈ 𝑈 ↔ ∃𝑥∃𝑑(𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶)))
45		nfv 1946	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦∃𝑑(𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶))
46		nfv 1946	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥 𝑣 = ⟨𝑦, 𝑑⟩
47		nfv 1946	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥 𝑦 ∈ 𝑋
48		nfcsb1v 3870	. . . . . . . . . . . . . . . . 17 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐶
49	48	nfcri 2914	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶
50	47, 49	nfan 1931	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥(𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)
51	46, 50	nfan 1931	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶))
52	51	nfex 2354	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶))
53		opeq1 4839	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → ⟨𝑥, 𝑑⟩ = ⟨𝑦, 𝑑⟩)
54	53	eqeq2d 2771	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → (𝑣 = ⟨𝑥, 𝑑⟩ ↔ 𝑣 = ⟨𝑦, 𝑑⟩))
55		eleq1w 2843	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝑋 ↔ 𝑦 ∈ 𝑋))
56		csbeq1a 3860	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 = 𝑦 → 𝐶 = ⦋𝑦 / 𝑥⦌𝐶)
57	56	eleq2d 2846	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑑 ∈ 𝐶 ↔ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶))
58	55, 57	anbi12d 644	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → ((𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶) ↔ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)))
59	54, 58	anbi12d 644	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → ((𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶)) ↔ (𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶))))
60	59	exbidv 1953	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (∃𝑑(𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶)) ↔ ∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶))))
61	45, 52, 60	cbvexv1 2371	. . . . . . . . . . . 12 ⊢ (∃𝑥∃𝑑(𝑣 = ⟨𝑥, 𝑑⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑑 ∈ 𝐶)) ↔ ∃𝑦∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)))
62	44, 61	sylbb 222	. . . . . . . . . . 11 ⊢ (𝑣 ∈ 𝑈 → ∃𝑦∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)))
63	62	ad5antlr 748	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) → ∃𝑦∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)))
64		2ndresdju.1	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → Disj 𝑥 ∈ 𝑋 𝐶)
65	64	ad9antr 755	. . . . . . . . . . . . . . . 16 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → Disj 𝑥 ∈ 𝑋 𝐶)
66		simp-5r 798	. . . . . . . . . . . . . . . 16 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑥 ∈ 𝑋)
67		simplr 781	. . . . . . . . . . . . . . . 16 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑦 ∈ 𝑋)
68		simp-4r 796	. . . . . . . . . . . . . . . 16 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑐 ∈ 𝐶)
69		simp-7r 802	. . . . . . . . . . . . . . . . . 18 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣))
70		simp-9r 806	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑢 ∈ 𝑈)
71	70	fvresd 6906	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ((2nd ↾ 𝑈)‘𝑢) = (2nd ‘𝑢))
72		simp-6r 800	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑢 = ⟨𝑥, 𝑐⟩)
73	72	fveq2d 6890	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → (2nd ‘𝑢) = (2nd ‘⟨𝑥, 𝑐⟩))
74		vex 3454	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑥 ∈ V
75		vex 3454	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑐 ∈ V
76	74, 75	op2nd 8011	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2nd ‘⟨𝑥, 𝑐⟩) = 𝑐
77	73, 76	eqtrdi 2811	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → (2nd ‘𝑢) = 𝑐)
78	71, 77	eqtrd 2795	. . . . . . . . . . . . . . . . . 18 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ((2nd ↾ 𝑈)‘𝑢) = 𝑐)
79		simp-8r 804	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑣 ∈ 𝑈)
80	79	fvresd 6906	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ((2nd ↾ 𝑈)‘𝑣) = (2nd ‘𝑣))
81		simpllr 788	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑣 = ⟨𝑦, 𝑑⟩)
82	81	fveq2d 6890	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → (2nd ‘𝑣) = (2nd ‘⟨𝑦, 𝑑⟩))
83		vex 3454	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑦 ∈ V
84		vex 3454	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑑 ∈ V
85	83, 84	op2nd 8011	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2nd ‘⟨𝑦, 𝑑⟩) = 𝑑
86	82, 85	eqtrdi 2811	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → (2nd ‘𝑣) = 𝑑)
87	80, 86	eqtrd 2795	. . . . . . . . . . . . . . . . . 18 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ((2nd ↾ 𝑈)‘𝑣) = 𝑑)
88	69, 78, 87	3eqtr3d 2803	. . . . . . . . . . . . . . . . 17 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑐 = 𝑑)
89		simpr 490	. . . . . . . . . . . . . . . . 17 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)
90	88, 89	eqeltrd 2860	. . . . . . . . . . . . . . . 16 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑐 ∈ ⦋𝑦 / 𝑥⦌𝐶)
91	48, 56	disjif 33220	. . . . . . . . . . . . . . . 16 ⊢ ((Disj 𝑥 ∈ 𝑋 𝐶 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) ∧ (𝑐 ∈ 𝐶 ∧ 𝑐 ∈ ⦋𝑦 / 𝑥⦌𝐶)) → 𝑥 = 𝑦)
92	65, 66, 67, 68, 90, 91	syl122anc 1406	. . . . . . . . . . . . . . 15 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑥 = 𝑦)
93	92, 88	opeq12d 4847	. . . . . . . . . . . . . 14 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → ⟨𝑥, 𝑐⟩ = ⟨𝑦, 𝑑⟩)
94	93, 72, 81	3eqtr4d 2805	. . . . . . . . . . . . 13 ⊢ ((((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ 𝑦 ∈ 𝑋) ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶) → 𝑢 = 𝑣)
95	94	anasss 472	. . . . . . . . . . . 12 ⊢ (((((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) ∧ 𝑣 = ⟨𝑦, 𝑑⟩) ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)) → 𝑢 = 𝑣)
96	95	expl 463	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) → ((𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)) → 𝑢 = 𝑣))
97	96	exlimdvv 1966	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) → (∃𝑦∃𝑑(𝑣 = ⟨𝑦, 𝑑⟩ ∧ (𝑦 ∈ 𝑋 ∧ 𝑑 ∈ ⦋𝑦 / 𝑥⦌𝐶)) → 𝑢 = 𝑣))
98	63, 97	mpd 16	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ 𝑥 ∈ 𝑋) ∧ 𝑐 ∈ 𝐶) → 𝑢 = 𝑣)
99	98	anasss 472	. . . . . . . 8 ⊢ ((((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) ∧ 𝑢 = ⟨𝑥, 𝑐⟩) ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)) → 𝑢 = 𝑣)
100	99	expl 463	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) → ((𝑢 = ⟨𝑥, 𝑐⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)) → 𝑢 = 𝑣))
101	100	exlimdv 1965	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) → (∃𝑐(𝑢 = ⟨𝑥, 𝑐⟩ ∧ (𝑥 ∈ 𝑋 ∧ 𝑐 ∈ 𝐶)) → 𝑢 = 𝑣))
102	36, 37, 41, 101	exlimimdd 2255	. . . . 5 ⊢ ((((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) ∧ ((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣)) → 𝑢 = 𝑣)
103	102	ex 418	. . . 4 ⊢ (((𝜑 ∧ 𝑢 ∈ 𝑈) ∧ 𝑣 ∈ 𝑈) → (((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣) → 𝑢 = 𝑣))
104	103	anasss 472	. . 3 ⊢ ((𝜑 ∧ (𝑢 ∈ 𝑈 ∧ 𝑣 ∈ 𝑈)) → (((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣) → 𝑢 = 𝑣))
105	104	ralrimivva 3205	. 2 ⊢ (𝜑 → ∀𝑢 ∈ 𝑈 ∀𝑣 ∈ 𝑈 (((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣) → 𝑢 = 𝑣))
106		dff13 7259	. 2 ⊢ ((2nd ↾ 𝑈):𝑈–1-1→𝐴 ↔ ((2nd ↾ 𝑈):𝑈⟶𝐴 ∧ ∀𝑢 ∈ 𝑈 ∀𝑣 ∈ 𝑈 (((2nd ↾ 𝑈)‘𝑢) = ((2nd ↾ 𝑈)‘𝑣) → 𝑢 = 𝑣)))
107	21, 105, 106	sylanbrc 595	1 ⊢ (𝜑 → (2nd ↾ 𝑈):𝑈–1-1→𝐴)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569  ∃wex 1811   ∈ wcel 2144  ∀wral 3076  Vcvv 3450  ⦋csb 3846   ⊆ wss 3895  {csn 4584  ⟨cop 4834  ∪ ciun 4950  Disj wdisj 5069   × cxp 5648   ↾ cres 5652   Fn wfn 6534  ⟶wf 6535  –1-1→wf1 6536  –onto→wfo 6537  ‘cfv 6539  2^nd c2nd 8001

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390  ax-un 7752

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-disj 5070  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-fv 6547  df-2nd 8003

This theorem is used by:  2ndresdjuf1o  33292  gsumpart  33671