Theorem iundisjf 30341

Description: Rewrite a countable union as a disjoint union. Cf. iundisj 24151. (Contributed by Thierry Arnoux, 31-Dec-2016.)

Hypotheses

Ref	Expression
iundisjf.1	⊢ Ⅎ𝑘𝐴
iundisjf.2	⊢ Ⅎ𝑛𝐵
iundisjf.3	⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)

Assertion

Ref	Expression
iundisjf	⊢ ∪ 𝑛 ∈ ℕ 𝐴 = ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)

Distinct variable group:   𝑘,𝑛

Allowed substitution hints:   𝐴(𝑘,𝑛)   𝐵(𝑘,𝑛)

Proof of Theorem iundisjf

Dummy variables 𝑚 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssrab2 4058	. . . . . . . . . 10 ⊢ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ ℕ
2		nnuz 12284	. . . . . . . . . 10 ⊢ ℕ = (ℤ≥‘1)
3	1, 2	sseqtri 4005	. . . . . . . . 9 ⊢ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ≥‘1)
4		rabn0 4341	. . . . . . . . . 10 ⊢ ({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ≠ ∅ ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
5	4	biimpri 230	. . . . . . . . 9 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ≠ ∅)
6		infssuzcl 12335	. . . . . . . . 9 ⊢ (({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ≥‘1) ∧ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ≠ ∅) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴})
7	3, 5, 6	sylancr 589	. . . . . . . 8 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴})
8		nfrab1 3386	. . . . . . . . . 10 ⊢ Ⅎ𝑛{𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}
9		nfcv 2979	. . . . . . . . . 10 ⊢ Ⅎ𝑛ℝ
10		nfcv 2979	. . . . . . . . . 10 ⊢ Ⅎ𝑛 <
11	8, 9, 10	nfinf 8948	. . . . . . . . 9 ⊢ Ⅎ𝑛inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
12		nfcv 2979	. . . . . . . . 9 ⊢ Ⅎ𝑛ℕ
13	11	nfcsb1 3908	. . . . . . . . . 10 ⊢ Ⅎ𝑛⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
14	13	nfcri 2973	. . . . . . . . 9 ⊢ Ⅎ𝑛 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
15		csbeq1a 3899	. . . . . . . . . 10 ⊢ (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐴 = ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
16	15	eleq2d 2900	. . . . . . . . 9 ⊢ (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
17	11, 12, 14, 16	elrabf 3678	. . . . . . . 8 ⊢ (inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ↔ (inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
18	7, 17	sylib 220	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → (inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
19	18	simpld 497	. . . . . 6 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ)
20	18	simprd 498	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
21	19	nnred 11655	. . . . . . . . 9 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
22	21	ltnrd 10776	. . . . . . . 8 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ¬ inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
23		eliun 4925	. . . . . . . . 9 ⊢ (𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵 ↔ ∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝑥 ∈ 𝐵)
24		nfcv 2979	. . . . . . . . . . 11 ⊢ Ⅎ𝑘ℕ
25		iundisjf.1	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘𝐴
26	25	nfcri 2973	. . . . . . . . . . 11 ⊢ Ⅎ𝑘 𝑥 ∈ 𝐴
27	24, 26	nfrex 3311	. . . . . . . . . 10 ⊢ Ⅎ𝑘∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴
28	26, 24	nfrabw 3387	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘{𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}
29		nfcv 2979	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘ℝ
30		nfcv 2979	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘 <
31	28, 29, 30	nfinf 8948	. . . . . . . . . . 11 ⊢ Ⅎ𝑘inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
32	31, 30, 31	nfbr 5115	. . . . . . . . . 10 ⊢ Ⅎ𝑘inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
33	21	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
34		elfzouz 13045	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 ∈ (ℤ≥‘1))
35	34, 2	eleqtrrdi 2926	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 ∈ ℕ)
36	35	ad2antlr 725	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℕ)
37	36	nnred 11655	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℝ)
38		simpr 487	. . . . . . . . . . . . . 14 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
39		nfcv 2979	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛𝑘
40		iundisjf.2	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑛𝐵
41	40	nfcri 2973	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛 𝑥 ∈ 𝐵
42		iundisjf.3	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)
43	42	eleq2d 2900	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
44	39, 12, 41, 43	elrabf 3678	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ↔ (𝑘 ∈ ℕ ∧ 𝑥 ∈ 𝐵))
45	36, 38, 44	sylanbrc 585	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴})
46		infssuzle 12334	. . . . . . . . . . . . 13 ⊢ (({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ≥‘1) ∧ 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
47	3, 45, 46	sylancr 589	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
48		elfzolt2 13050	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
49	48	ad2antlr 725	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
50	33, 37, 33, 47, 49	lelttrd 10800	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
51	50	exp31 422	. . . . . . . . . 10 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → (𝑥 ∈ 𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))))
52	27, 32, 51	rexlimd 3319	. . . . . . . . 9 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → (∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝑥 ∈ 𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
53	23, 52	syl5bi 244	. . . . . . . 8 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → (𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
54	22, 53	mtod 200	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)
55	20, 54	eldifd 3949	. . . . . 6 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → 𝑥 ∈ (⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵))
56		csbeq1 3888	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ⦋𝑚 / 𝑛⦌𝐴 = ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
57	31	nfeq2 2997	. . . . . . . . . 10 ⊢ Ⅎ𝑘 𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
58		nfcv 2979	. . . . . . . . . 10 ⊢ Ⅎ𝑘(1..^𝑚)
59		nfcv 2979	. . . . . . . . . . 11 ⊢ Ⅎ𝑘1
60		nfcv 2979	. . . . . . . . . . 11 ⊢ Ⅎ𝑘..^
61	59, 60, 31	nfov 7188	. . . . . . . . . 10 ⊢ Ⅎ𝑘(1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
62		oveq2 7166	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
63		eqidd 2824	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐵 = 𝐵)
64	57, 58, 61, 62, 63	iuneq12df 4947	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ∪ 𝑘 ∈ (1..^𝑚)𝐵 = ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)
65	56, 64	difeq12d 4102	. . . . . . . 8 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵) = (⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵))
66	65	eleq2d 2900	. . . . . . 7 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵) ↔ 𝑥 ∈ (⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)))
67	66	rspcev 3625	. . . . . 6 ⊢ ((inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥 ∈ (⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)) → ∃𝑚 ∈ ℕ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
68	19, 55, 67	syl2anc 586	. . . . 5 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ∃𝑚 ∈ ℕ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
69		nfv 1915	. . . . . 6 ⊢ Ⅎ𝑚 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)
70		nfcsb1v 3909	. . . . . . . 8 ⊢ Ⅎ𝑛⦋𝑚 / 𝑛⦌𝐴
71		nfcv 2979	. . . . . . . . 9 ⊢ Ⅎ𝑛(1..^𝑚)
72	71, 40	nfiun 4951	. . . . . . . 8 ⊢ Ⅎ𝑛∪ 𝑘 ∈ (1..^𝑚)𝐵
73	70, 72	nfdif 4104	. . . . . . 7 ⊢ Ⅎ𝑛(⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
74	73	nfcri 2973	. . . . . 6 ⊢ Ⅎ𝑛 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
75		csbeq1a 3899	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → 𝐴 = ⦋𝑚 / 𝑛⦌𝐴)
76		oveq2 7166	. . . . . . . . 9 ⊢ (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
77	76	iuneq1d 4948	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → ∪ 𝑘 ∈ (1..^𝑛)𝐵 = ∪ 𝑘 ∈ (1..^𝑚)𝐵)
78	75, 77	difeq12d 4102	. . . . . . 7 ⊢ (𝑛 = 𝑚 → (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) = (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
79	78	eleq2d 2900	. . . . . 6 ⊢ (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)))
80	69, 74, 79	cbvrexw 3444	. . . . 5 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑚 ∈ ℕ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
81	68, 80	sylibr 236	. . . 4 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
82		eldifi 4105	. . . . 5 ⊢ (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥 ∈ 𝐴)
83	82	reximi 3245	. . . 4 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
84	81, 83	impbii 211	. . 3 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
85		eliun 4925	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
86		eliun 4925	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
87	84, 85, 86	3bitr4i 305	. 2 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ 𝐴 ↔ 𝑥 ∈ ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
88	87	eqriv 2820	1 ⊢ ∪ 𝑛 ∈ ℕ 𝐴 = ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  Ⅎwnfc 2963   ≠ wne 3018  ∃wrex 3141  {crab 3144  ⦋csb 3885   ∖ cdif 3935   ⊆ wss 3938  ∅c0 4293  ∪ ciun 4921   class class class wbr 5068  ‘cfv 6357  (class class class)co 7158  infcinf 8907  ℝcr 10538  1c1 10540   < clt 10677   ≤ cle 10678  ℕcn 11640  ℤ_≥cuz 12246  ..^cfzo 13036

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463  ax-cnex 10595  ax-resscn 10596  ax-1cn 10597  ax-icn 10598  ax-addcl 10599  ax-addrcl 10600  ax-mulcl 10601  ax-mulrcl 10602  ax-mulcom 10603  ax-addass 10604  ax-mulass 10605  ax-distr 10606  ax-i2m1 10607  ax-1ne0 10608  ax-1rid 10609  ax-rnegex 10610  ax-rrecex 10611  ax-cnre 10612  ax-pre-lttri 10613  ax-pre-lttrn 10614  ax-pre-ltadd 10615  ax-pre-mulgt0 10616

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-nel 3126  df-ral 3145  df-rex 3146  df-reu 3147  df-rmo 3148  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-lim 6198  df-suc 6199  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-riota 7116  df-ov 7161  df-oprab 7162  df-mpo 7163  df-om 7583  df-1st 7691  df-2nd 7692  df-wrecs 7949  df-recs 8010  df-rdg 8048  df-er 8291  df-en 8512  df-dom 8513  df-sdom 8514  df-sup 8908  df-inf 8909  df-pnf 10679  df-mnf 10680  df-xr 10681  df-ltxr 10682  df-le 10683  df-sub 10874  df-neg 10875  df-nn 11641  df-n0 11901  df-z 11985  df-uz 12247  df-fz 12896  df-fzo 13037

This theorem is referenced by:  iundisjcnt  30523