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Theorem iundisj 23123
 Description: Rewrite a countable union as a disjoint union. (Contributed by Mario Carneiro, 20-Mar-2014.)
Hypothesis
Ref Expression
iundisj.1 (𝑛 = 𝑘𝐴 = 𝐵)
Assertion
Ref Expression
iundisj 𝑛 ∈ ℕ 𝐴 = 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵)
Distinct variable groups:   𝑘,𝑛   𝐴,𝑘   𝐵,𝑛
Allowed substitution hints:   𝐴(𝑛)   𝐵(𝑘)

Proof of Theorem iundisj
Dummy variables 𝑥 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ssrab2 3650 . . . . . . . . . 10 {𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ ℕ
2 nnuz 11599 . . . . . . . . . 10 ℕ = (ℤ‘1)
31, 2sseqtri 3600 . . . . . . . . 9 {𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1)
4 rabn0 3912 . . . . . . . . . 10 ({𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅ ↔ ∃𝑛 ∈ ℕ 𝑥𝐴)
54biimpri 217 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → {𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅)
6 infssuzcl 11648 . . . . . . . . 9 (({𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1) ∧ {𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
73, 5, 6sylancr 694 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
8 nfrab1 3099 . . . . . . . . . 10 𝑛{𝑛 ∈ ℕ ∣ 𝑥𝐴}
9 nfcv 2751 . . . . . . . . . 10 𝑛
10 nfcv 2751 . . . . . . . . . 10 𝑛 <
118, 9, 10nfinf 8271 . . . . . . . . 9 𝑛inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )
12 nfcv 2751 . . . . . . . . 9 𝑛
1311nfcsb1 3514 . . . . . . . . . 10 𝑛inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴
1413nfcri 2745 . . . . . . . . 9 𝑛 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴
15 csbeq1a 3508 . . . . . . . . . 10 (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝐴 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
1615eleq2d 2673 . . . . . . . . 9 (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (𝑥𝐴𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
1711, 12, 14, 16elrabf 3329 . . . . . . . 8 (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴} ↔ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
187, 17sylib 207 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴 → (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
1918simpld 474 . . . . . 6 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ)
2018simprd 478 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
2119nnred 10912 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℝ)
2221ltnrd 10050 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → ¬ inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
23 eliun 4460 . . . . . . . . 9 (𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵 ↔ ∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝑥𝐵)
2421ad2antrr 758 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℝ)
25 elfzouz 12343 . . . . . . . . . . . . . . 15 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 ∈ (ℤ‘1))
2625, 2syl6eleqr 2699 . . . . . . . . . . . . . 14 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 ∈ ℕ)
2726ad2antlr 759 . . . . . . . . . . . . 13 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ ℕ)
2827nnred 10912 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ ℝ)
29 simpr 476 . . . . . . . . . . . . . 14 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑥𝐵)
30 iundisj.1 . . . . . . . . . . . . . . . 16 (𝑛 = 𝑘𝐴 = 𝐵)
3130eleq2d 2673 . . . . . . . . . . . . . . 15 (𝑛 = 𝑘 → (𝑥𝐴𝑥𝐵))
3231elrab 3331 . . . . . . . . . . . . . 14 (𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴} ↔ (𝑘 ∈ ℕ ∧ 𝑥𝐵))
3327, 29, 32sylanbrc 695 . . . . . . . . . . . . 13 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
34 infssuzle 11647 . . . . . . . . . . . . 13 (({𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1) ∧ 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴}) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ≤ 𝑘)
353, 33, 34sylancr 694 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ≤ 𝑘)
36 elfzolt2 12348 . . . . . . . . . . . . 13 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3736ad2antlr 759 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3824, 28, 24, 35, 37lelttrd 10074 . . . . . . . . . . 11 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3938ex 449 . . . . . . . . . 10 ((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) → (𝑥𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4039rexlimdva 3013 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → (∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝑥𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4123, 40syl5bi 231 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → (𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4222, 41mtod 188 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴 → ¬ 𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)
4320, 42eldifd 3551 . . . . . 6 (∃𝑛 ∈ ℕ 𝑥𝐴𝑥 ∈ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵))
44 csbeq1 3502 . . . . . . . . 9 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝑚 / 𝑛𝐴 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
45 oveq2 6557 . . . . . . . . . 10 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4645iuneq1d 4481 . . . . . . . . 9 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝑘 ∈ (1..^𝑚)𝐵 = 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)
4744, 46difeq12d 3691 . . . . . . . 8 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵) = (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵))
4847eleq2d 2673 . . . . . . 7 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵) ↔ 𝑥 ∈ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)))
4948rspcev 3282 . . . . . 6 ((inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥 ∈ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)) → ∃𝑚 ∈ ℕ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
5019, 43, 49syl2anc 691 . . . . 5 (∃𝑛 ∈ ℕ 𝑥𝐴 → ∃𝑚 ∈ ℕ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
51 nfv 1830 . . . . . 6 𝑚 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵)
52 nfcsb1v 3515 . . . . . . . 8 𝑛𝑚 / 𝑛𝐴
53 nfcv 2751 . . . . . . . 8 𝑛 𝑘 ∈ (1..^𝑚)𝐵
5452, 53nfdif 3693 . . . . . . 7 𝑛(𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)
5554nfcri 2745 . . . . . 6 𝑛 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)
56 csbeq1a 3508 . . . . . . . 8 (𝑛 = 𝑚𝐴 = 𝑚 / 𝑛𝐴)
57 oveq2 6557 . . . . . . . . 9 (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
5857iuneq1d 4481 . . . . . . . 8 (𝑛 = 𝑚 𝑘 ∈ (1..^𝑛)𝐵 = 𝑘 ∈ (1..^𝑚)𝐵)
5956, 58difeq12d 3691 . . . . . . 7 (𝑛 = 𝑚 → (𝐴 𝑘 ∈ (1..^𝑛)𝐵) = (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
6059eleq2d 2673 . . . . . 6 (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)))
6151, 55, 60cbvrex 3144 . . . . 5 (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑚 ∈ ℕ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
6250, 61sylibr 223 . . . 4 (∃𝑛 ∈ ℕ 𝑥𝐴 → ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
63 eldifi 3694 . . . . 5 (𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥𝐴)
6463reximi 2994 . . . 4 (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) → ∃𝑛 ∈ ℕ 𝑥𝐴)
6562, 64impbii 198 . . 3 (∃𝑛 ∈ ℕ 𝑥𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
66 eliun 4460 . . 3 (𝑥 𝑛 ∈ ℕ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥𝐴)
67 eliun 4460 . . 3 (𝑥 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
6865, 66, 673bitr4i 291 . 2 (𝑥 𝑛 ∈ ℕ 𝐴𝑥 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
6968eqriv 2607 1 𝑛 ∈ ℕ 𝐴 = 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ 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:  iunmbl  23128  volsup  23131  sigapildsys  29552  carsgclctunlem3  29709  voliunnfl  32623
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