Theorem iundisjf 28784

Description: Rewrite a countable union as a disjoint union. Cf. iundisj 23123. (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 3650	. . . . . . . . . 10 ⊢ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ ℕ
2		nnuz 11599	. . . . . . . . . 10 ⊢ ℕ = (ℤ≥‘1)
3	1, 2	sseqtri 3600	. . . . . . . . 9 ⊢ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ≥‘1)
4		rabn0 3912	. . . . . . . . . 10 ⊢ ({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ≠ ∅ ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
5	4	biimpri 217	. . . . . . . . 9 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ≠ ∅)
6		infssuzcl 11648	. . . . . . . . 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 694	. . . . . . . 8 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴})
8		nfrab1 3099	. . . . . . . . . 10 ⊢ Ⅎ𝑛{𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}
9		nfcv 2751	. . . . . . . . . 10 ⊢ Ⅎ𝑛ℝ
10		nfcv 2751	. . . . . . . . . 10 ⊢ Ⅎ𝑛 <
11	8, 9, 10	nfinf 8271	. . . . . . . . 9 ⊢ Ⅎ𝑛inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
12		nfcv 2751	. . . . . . . . 9 ⊢ Ⅎ𝑛ℕ
13	11	nfcsb1 3514	. . . . . . . . . 10 ⊢ Ⅎ𝑛⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
14	13	nfcri 2745	. . . . . . . . 9 ⊢ Ⅎ𝑛 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
15		csbeq1a 3508	. . . . . . . . . 10 ⊢ (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐴 = ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
16	15	eleq2d 2673	. . . . . . . . 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 3329	. . . . . . . 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 207	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → (inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
19	18	simpld 474	. . . . . 6 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℕ)
20	18	simprd 478	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → 𝑥 ∈ ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
21	19	nnred 10912	. . . . . . . . 9 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
22	21	ltnrd 10050	. . . . . . . 8 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ¬ inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
23		eliun 4460	. . . . . . . . 9 ⊢ (𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵 ↔ ∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝑥 ∈ 𝐵)
24		nfcv 2751	. . . . . . . . . . 11 ⊢ Ⅎ𝑘ℕ
25		iundisjf.1	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘𝐴
26	25	nfcri 2745	. . . . . . . . . . 11 ⊢ Ⅎ𝑘 𝑥 ∈ 𝐴
27	24, 26	nfrex 2990	. . . . . . . . . 10 ⊢ Ⅎ𝑘∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴
28	26, 24	nfrab 3100	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘{𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}
29		nfcv 2751	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘ℝ
30		nfcv 2751	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘 <
31	28, 29, 30	nfinf 8271	. . . . . . . . . . 11 ⊢ Ⅎ𝑘inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
32	31, 30, 31	nfbr 4629	. . . . . . . . . 10 ⊢ Ⅎ𝑘inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
33	21	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
34		elfzouz 12343	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 ∈ (ℤ≥‘1))
35	34, 2	syl6eleqr 2699	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 ∈ ℕ)
36	35	ad2antlr 759	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℕ)
37	36	nnred 10912	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℝ)
38		simpr 476	. . . . . . . . . . . . . 14 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
39		nfcv 2751	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛𝑘
40		iundisjf.2	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑛𝐵
41	40	nfcri 2745	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛 𝑥 ∈ 𝐵
42		iundisjf.3	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)
43	42	eleq2d 2673	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
44	39, 12, 41, 43	elrabf 3329	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ↔ (𝑘 ∈ ℕ ∧ 𝑥 ∈ 𝐵))
45	36, 38, 44	sylanbrc 695	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴})
46		infssuzle 11647	. . . . . . . . . . . . 13 ⊢ (({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ≥‘1) ∧ 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
47	3, 45, 46	sylancr 694	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
48		elfzolt2 12348	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
49	48	ad2antlr 759	. . . . . . . . . . . 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 10074	. . . . . . . . . . 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 628	. . . . . . . . . 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 3008	. . . . . . . . 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 231	. . . . . . . 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 188	. . . . . . 7 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)
55	20, 54	eldifd 3551	. . . . . 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 3502	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ⦋𝑚 / 𝑛⦌𝐴 = ⦋inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
57	31	nfeq2 2766	. . . . . . . . . 10 ⊢ Ⅎ𝑘 𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )
58		nfcv 2751	. . . . . . . . . 10 ⊢ Ⅎ𝑘(1..^𝑚)
59		nfcv 2751	. . . . . . . . . . 11 ⊢ Ⅎ𝑘1
60		nfcv 2751	. . . . . . . . . . 11 ⊢ Ⅎ𝑘..^
61	59, 60, 31	nfov 6575	. . . . . . . . . 10 ⊢ Ⅎ𝑘(1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
62		oveq2 6557	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
63		eqidd 2611	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐵 = 𝐵)
64	57, 58, 61, 62, 63	iuneq12df 4480	. . . . . . . . 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 3691	. . . . . . . 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 2673	. . . . . . 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 3282	. . . . . 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 691	. . . . 5 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ∃𝑚 ∈ ℕ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
69		nfv 1830	. . . . . 6 ⊢ Ⅎ𝑚 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)
70		nfcsb1v 3515	. . . . . . . 8 ⊢ Ⅎ𝑛⦋𝑚 / 𝑛⦌𝐴
71		nfcv 2751	. . . . . . . . 9 ⊢ Ⅎ𝑛(1..^𝑚)
72	71, 40	nfiun 4484	. . . . . . . 8 ⊢ Ⅎ𝑛∪ 𝑘 ∈ (1..^𝑚)𝐵
73	70, 72	nfdif 3693	. . . . . . 7 ⊢ Ⅎ𝑛(⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
74	73	nfcri 2745	. . . . . 6 ⊢ Ⅎ𝑛 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
75		csbeq1a 3508	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → 𝐴 = ⦋𝑚 / 𝑛⦌𝐴)
76		oveq2 6557	. . . . . . . . 9 ⊢ (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
77	76	iuneq1d 4481	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → ∪ 𝑘 ∈ (1..^𝑛)𝐵 = ∪ 𝑘 ∈ (1..^𝑚)𝐵)
78	75, 77	difeq12d 3691	. . . . . . 7 ⊢ (𝑛 = 𝑚 → (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) = (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
79	78	eleq2d 2673	. . . . . 6 ⊢ (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)))
80	69, 74, 79	cbvrex 3144	. . . . 5 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑚 ∈ ℕ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
81	68, 80	sylibr 223	. . . 4 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 → ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
82		eldifi 3694	. . . . 5 ⊢ (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥 ∈ 𝐴)
83	82	reximi 2994	. . . 4 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
84	81, 83	impbii 198	. . 3 ⊢ (∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
85		eliun 4460	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ 𝐴)
86		eliun 4460	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
87	84, 85, 86	3bitr4i 291	. 2 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ ℕ 𝐴 ↔ 𝑥 ∈ ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
88	87	eqriv 2607	1 ⊢ ∪ 𝑛 ∈ ℕ 𝐴 = ∪ 𝑛 ∈ ℕ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  Ⅎwnfc 2738   ≠ wne 2780  ∃wrex 2897  {crab 2900  ⦋csb 3499   ∖ cdif 3537   ⊆ wss 3540  ∅c0 3874  ∪ ciun 4455   class class class wbr 4583  ‘cfv 5804  (class class class)co 6549  infcinf 8230  ℝcr 9814  1c1 9816   < clt 9953   ≤ cle 9954  ℕcn 10897  ℤ_≥cuz 11563  ..^cfzo 12334

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-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

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-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  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-iun 4457  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-riota 6511  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-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  df-inf 8232  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335

This theorem is referenced by:  iundisjcnt  28944