iundisjfi - Mathbox for Thierry Arnoux

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Theorem iundisjfi 32007

Description: Rewrite a countable union as a disjoint union, finite version. Cf. iundisj 25065. (Contributed by Thierry Arnoux, 15-Feb-2017.)

**Hypotheses**
Ref	Expression
iundisj3.0	⊢ Ⅎ𝑛𝐵
iundisj3.1	⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)

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

Distinct variable groups: 𝑘,𝑛,𝑁 𝐴,𝑘 Allowed substitution hints: 𝐴(𝑛) 𝐵(𝑘,𝑛)

Proof of Theorem iundisjfi Dummy variables 𝑚 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssrab2 4078	. . . . . . 7 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (1..^𝑁)
2		fzossnn 13681	. . . . . . . . . 10 ⊢ (1..^𝑁) ⊆ ℕ
3		nnuz 12865	. . . . . . . . . 10 ⊢ ℕ = (ℤ_≥‘1)
4	2, 3	sseqtri 4019	. . . . . . . . 9 ⊢ (1..^𝑁) ⊆ (ℤ_≥‘1)
5	1, 4	sstri 3992	. . . . . . . 8 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ_≥‘1)
6		rabn0 4386	. . . . . . . . 9 ⊢ ({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ≠ ∅ ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴)
7	6	biimpri 227	. . . . . . . 8 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ≠ ∅)
8		infssuzcl 12916	. . . . . . . 8 ⊢ (({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ_≥‘1) ∧ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ≠ ∅) → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴})
9	5, 7, 8	sylancr 588	. . . . . . 7 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴})
10	1, 9	sselid 3981	. . . . . 6 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁))
11		nfrab1 3452	. . . . . . . . . . 11 ⊢ Ⅎ𝑛{𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}
12		nfcv 2904	. . . . . . . . . . 11 ⊢ Ⅎ𝑛ℝ
13		nfcv 2904	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 <
14	11, 12, 13	nfinf 9477	. . . . . . . . . 10 ⊢ Ⅎ𝑛inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )
15		nfcv 2904	. . . . . . . . . 10 ⊢ Ⅎ𝑛(1..^𝑁)
16	14	nfcsb1 3918	. . . . . . . . . . 11 ⊢ Ⅎ𝑛⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
17	16	nfcri 2891	. . . . . . . . . 10 ⊢ Ⅎ𝑛 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
18		csbeq1a 3908	. . . . . . . . . . 11 ⊢ (𝑛 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐴 = ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
19	18	eleq2d 2820	. . . . . . . . . 10 ⊢ (𝑛 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
20	14, 15, 17, 19	elrabf 3680	. . . . . . . . 9 ⊢ (inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ↔ (inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁) ∧ 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
21	9, 20	sylib 217	. . . . . . . 8 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → (inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁) ∧ 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴))
22	21	simprd 497	. . . . . . 7 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
23	1, 2	sstri 3992	. . . . . . . . . . 11 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ ℕ
24		nnssre 12216	. . . . . . . . . . 11 ⊢ ℕ ⊆ ℝ
25	23, 24	sstri 3992	. . . . . . . . . 10 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ ℝ
26	25, 9	sselid 3981	. . . . . . . . 9 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
27	26	ltnrd 11348	. . . . . . . 8 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ¬ inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
28		eliun 5002	. . . . . . . . 9 ⊢ (𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵 ↔ ∃𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝑥 ∈ 𝐵)
29	26	ad2antrr 725	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
30		elfzouz2 13647	. . . . . . . . . . . . . . . 16 ⊢ (inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁) → 𝑁 ∈ (ℤ_≥‘inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
31		fzoss2 13660	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ (ℤ_≥‘inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )) ⊆ (1..^𝑁))
32	10, 30, 31	3syl 18	. . . . . . . . . . . . . . 15 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )) ⊆ (1..^𝑁))
33	32	sselda 3983	. . . . . . . . . . . . . 14 ⊢ ((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) → 𝑘 ∈ (1..^𝑁))
34	33	adantr 482	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ (1..^𝑁))
35	2, 34	sselid 3981	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℕ)
36	35	nnred 12227	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℝ)
37		simpr 486	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
38		nfcv 2904	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑛𝑘
39		iundisj3.0	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛𝐵
40	39	nfcri 2891	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑛 𝑥 ∈ 𝐵
41		iundisj3.1	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)
42	41	eleq2d 2820	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 𝑘 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
43	38, 15, 40, 42	elrabf 3680	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ↔ (𝑘 ∈ (1..^𝑁) ∧ 𝑥 ∈ 𝐵))
44	34, 37, 43	sylanbrc 584	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴})
45		infssuzle 12915	. . . . . . . . . . . 12 ⊢ (({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ_≥‘1) ∧ 𝑘 ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}) → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
46	5, 44, 45	sylancr 588	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ≤ 𝑘)
47		elfzolt2 13641	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
48	47	ad2antlr 726	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
49	29, 36, 29, 46, 48	lelttrd 11372	. . . . . . . . . 10 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
50	49	rexlimdva2 3158	. . . . . . . . 9 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → (∃𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝑥 ∈ 𝐵 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
51	28, 50	biimtrid 241	. . . . . . . 8 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → (𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
52	27, 51	mtod 197	. . . . . . 7 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)
53	22, 52	eldifd 3960	. . . . . 6 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → 𝑥 ∈ (⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵))
54		csbeq1 3897	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ⦋𝑚 / 𝑛⦌𝐴 = ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
55		oveq2 7417	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
56	55	iuneq1d 5025	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ∪ 𝑘 ∈ (1..^𝑚)𝐵 = ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)
57	54, 56	difeq12d 4124	. . . . . . . 8 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵) = (⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵))
58	57	eleq2d 2820	. . . . . . 7 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵) ↔ 𝑥 ∈ (⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)))
59	58	rspcev 3613	. . . . . 6 ⊢ ((inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁) ∧ 𝑥 ∈ (⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))𝐵)) → ∃𝑚 ∈ (1..^𝑁)𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
60	10, 53, 59	syl2anc 585	. . . . 5 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ∃𝑚 ∈ (1..^𝑁)𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
61		nfv 1918	. . . . . 6 ⊢ Ⅎ𝑚 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)
62		nfcsb1v 3919	. . . . . . . 8 ⊢ Ⅎ𝑛⦋𝑚 / 𝑛⦌𝐴
63		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑛(1..^𝑚)
64	63, 39	nfiun 5028	. . . . . . . 8 ⊢ Ⅎ𝑛∪ 𝑘 ∈ (1..^𝑚)𝐵
65	62, 64	nfdif 4126	. . . . . . 7 ⊢ Ⅎ𝑛(⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
66	65	nfcri 2891	. . . . . 6 ⊢ Ⅎ𝑛 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
67		csbeq1a 3908	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → 𝐴 = ⦋𝑚 / 𝑛⦌𝐴)
68		oveq2 7417	. . . . . . . . 9 ⊢ (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
69	68	iuneq1d 5025	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → ∪ 𝑘 ∈ (1..^𝑛)𝐵 = ∪ 𝑘 ∈ (1..^𝑚)𝐵)
70	67, 69	difeq12d 4124	. . . . . . 7 ⊢ (𝑛 = 𝑚 → (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) = (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
71	70	eleq2d 2820	. . . . . 6 ⊢ (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)))
72	61, 66, 71	cbvrexw 3305	. . . . 5 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑚 ∈ (1..^𝑁)𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
73	60, 72	sylibr 233	. . . 4 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
74		eldifi 4127	. . . . 5 ⊢ (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥 ∈ 𝐴)
75	74	reximi 3085	. . . 4 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴)
76	73, 75	impbii 208	. . 3 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
77		eliun 5002	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)𝐴 ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴)
78		eliun 5002	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
79	76, 77, 78	3bitr4i 303	. 2 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)𝐴 ↔ 𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
80	79	eqriv 2730	1 ⊢ ∪ 𝑛 ∈ (1..^𝑁)𝐴 = ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 397 = wceq 1542 ∈ wcel 2107 Ⅎwnfc 2884 ≠ wne 2941 ∃wrex 3071 {crab 3433 ⦋csb 3894 ∖ cdif 3946 ⊆ wss 3949 ∅c0 4323 ∪ ciun 4998 class class class wbr 5149 ‘cfv 6544 (class class class)co 7409 infcinf 9436 ℝcr 11109 1c1 11111 < clt 11248 ≤ cle 11249 ℕcn 12212 ℤ_≥cuz 12822 ..^cfzo 13627

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-n0 12473 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628

This theorem is referenced by: iundisjcnt 32009

W3C validator