iundisjfi - Mathbox for Thierry Arnoux

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Theorem iundisjfi 32609

Description: Rewrite a countable union as a disjoint union, finite version. Cf. iundisj 25495. (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 4069	. . . . . . 7 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (1..^𝑁)
2		fzossnn 13713	. . . . . . . . . 10 ⊢ (1..^𝑁) ⊆ ℕ
3		nnuz 12895	. . . . . . . . . 10 ⊢ ℕ = (ℤ_≥‘1)
4	2, 3	sseqtri 4009	. . . . . . . . 9 ⊢ (1..^𝑁) ⊆ (ℤ_≥‘1)
5	1, 4	sstri 3982	. . . . . . . 8 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ (ℤ_≥‘1)
6		rabn0 4381	. . . . . . . . 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 12946	. . . . . . . 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 585	. . . . . . 7 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴})
10	1, 9	sselid 3970	. . . . . 6 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁))
11		nfrab1 3439	. . . . . . . . . . 11 ⊢ Ⅎ𝑛{𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}
12		nfcv 2892	. . . . . . . . . . 11 ⊢ Ⅎ𝑛ℝ
13		nfcv 2892	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 <
14	11, 12, 13	nfinf 9505	. . . . . . . . . 10 ⊢ Ⅎ𝑛inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )
15		nfcv 2892	. . . . . . . . . 10 ⊢ Ⅎ𝑛(1..^𝑁)
16	14	nfcsb1 3908	. . . . . . . . . . 11 ⊢ Ⅎ𝑛⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
17	16	nfcri 2882	. . . . . . . . . 10 ⊢ Ⅎ𝑛 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴
18		csbeq1a 3898	. . . . . . . . . . 11 ⊢ (𝑛 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → 𝐴 = ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
19	18	eleq2d 2811	. . . . . . . . . 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 3670	. . . . . . . . 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 494	. . . . . . 7 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → 𝑥 ∈ ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
23	1, 2	sstri 3982	. . . . . . . . . . 11 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ ℕ
24		nnssre 12246	. . . . . . . . . . 11 ⊢ ℕ ⊆ ℝ
25	23, 24	sstri 3982	. . . . . . . . . 10 ⊢ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ⊆ ℝ
26	25, 9	sselid 3970	. . . . . . . . 9 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ ℝ)
27	26	ltnrd 11378	. . . . . . . 8 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ¬ inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
28		eliun 4995	. . . . . . . . 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 724	. . . . . . . . . . 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 13679	. . . . . . . . . . . . . . . 16 ⊢ (inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) ∈ (1..^𝑁) → 𝑁 ∈ (ℤ_≥‘inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
31		fzoss2 13692	. . . . . . . . . . . . . . . 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 3972	. . . . . . . . . . . . . 14 ⊢ ((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) → 𝑘 ∈ (1..^𝑁))
34	33	adantr 479	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ (1..^𝑁))
35	2, 34	sselid 3970	. . . . . . . . . . . 12 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℕ)
36	35	nnred 12257	. . . . . . . . . . 11 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑘 ∈ ℝ)
37		simpr 483	. . . . . . . . . . . . 13 ⊢ (((∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 ∧ 𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
38		nfcv 2892	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑛𝑘
39		iundisj3.0	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑛𝐵
40	39	nfcri 2882	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑛 𝑥 ∈ 𝐵
41		iundisj3.1	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → 𝐴 = 𝐵)
42	41	eleq2d 2811	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 𝑘 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
43	38, 15, 40, 42	elrabf 3670	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ {𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴} ↔ (𝑘 ∈ (1..^𝑁) ∧ 𝑥 ∈ 𝐵))
44	34, 37, 43	sylanbrc 581	. . . . . . . . . . . 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 12945	. . . . . . . . . . . 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 585	. . . . . . . . . . 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 13673	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ))
48	47	ad2antlr 725	. . . . . . . . . . 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 11402	. . . . . . . . . 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 3147	. . . . . . . . 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 3950	. . . . . 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 3887	. . . . . . . . 9 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → ⦋𝑚 / 𝑛⦌𝐴 = ⦋inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) / 𝑛⦌𝐴)
55		oveq2 7424	. . . . . . . . . 10 ⊢ (𝑚 = inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ (1..^𝑁) ∣ 𝑥 ∈ 𝐴}, ℝ, < )))
56	55	iuneq1d 5018	. . . . . . . . 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 4115	. . . . . . . 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 2811	. . . . . . 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 3601	. . . . . 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 582	. . . . 5 ⊢ (∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴 → ∃𝑚 ∈ (1..^𝑁)𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
61		nfv 1909	. . . . . 6 ⊢ Ⅎ𝑚 𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)
62		nfcsb1v 3909	. . . . . . . 8 ⊢ Ⅎ𝑛⦋𝑚 / 𝑛⦌𝐴
63		nfcv 2892	. . . . . . . . 9 ⊢ Ⅎ𝑛(1..^𝑚)
64	63, 39	nfiun 5021	. . . . . . . 8 ⊢ Ⅎ𝑛∪ 𝑘 ∈ (1..^𝑚)𝐵
65	62, 64	nfdif 4117	. . . . . . 7 ⊢ Ⅎ𝑛(⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
66	65	nfcri 2882	. . . . . 6 ⊢ Ⅎ𝑛 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)
67		csbeq1a 3898	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → 𝐴 = ⦋𝑚 / 𝑛⦌𝐴)
68		oveq2 7424	. . . . . . . . 9 ⊢ (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
69	68	iuneq1d 5018	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → ∪ 𝑘 ∈ (1..^𝑛)𝐵 = ∪ 𝑘 ∈ (1..^𝑚)𝐵)
70	67, 69	difeq12d 4115	. . . . . . 7 ⊢ (𝑛 = 𝑚 → (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) = (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵))
71	70	eleq2d 2811	. . . . . 6 ⊢ (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (⦋𝑚 / 𝑛⦌𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑚)𝐵)))
72	61, 66, 71	cbvrexw 3295	. . . . 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 4119	. . . . 5 ⊢ (𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥 ∈ 𝐴)
75	74	reximi 3074	. . . 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 4995	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)𝐴 ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ 𝐴)
78		eliun 4995	. . 3 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ (1..^𝑁)𝑥 ∈ (𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
79	76, 77, 78	3bitr4i 302	. 2 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)𝐴 ↔ 𝑥 ∈ ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵))
80	79	eqriv 2722	1 ⊢ ∪ 𝑛 ∈ (1..^𝑁)𝐴 = ∪ 𝑛 ∈ (1..^𝑁)(𝐴 ∖ ∪ 𝑘 ∈ (1..^𝑛)𝐵)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 = wceq 1533 ∈ wcel 2098 Ⅎwnfc 2875 ≠ wne 2930 ∃wrex 3060 {crab 3419 ⦋csb 3884 ∖ cdif 3936 ⊆ wss 3939 ∅c0 4318 ∪ ciun 4991 class class class wbr 5143 ‘cfv 6543 (class class class)co 7416 infcinf 9464 ℝcr 11137 1c1 11139 < clt 11278 ≤ cle 11279 ℕcn 12242 ℤ_≥cuz 12852 ..^cfzo 13659

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7738 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3769 df-csb 3885 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-pss 3959 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7372 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7869 df-1st 7991 df-2nd 7992 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-er 8723 df-en 8963 df-dom 8964 df-sdom 8965 df-sup 9465 df-inf 9466 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-n0 12503 df-z 12589 df-uz 12853 df-fz 13517 df-fzo 13660

This theorem is referenced by: iundisjcnt 32611

W3C validator