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Theorem iundisj 25517
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 4034 . . . . . . . . . 10 {𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ ℕ
2 nnuz 12802 . . . . . . . . . 10 ℕ = (ℤ‘1)
31, 2sseqtri 3984 . . . . . . . . 9 {𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1)
4 rabn0 4343 . . . . . . . . . 10 ({𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅ ↔ ∃𝑛 ∈ ℕ 𝑥𝐴)
54biimpri 228 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → {𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅)
6 infssuzcl 12857 . . . . . . . . 9 (({𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1) ∧ {𝑛 ∈ ℕ ∣ 𝑥𝐴} ≠ ∅) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
73, 5, 6sylancr 588 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
8 nfrab1 3421 . . . . . . . . . 10 𝑛{𝑛 ∈ ℕ ∣ 𝑥𝐴}
9 nfcv 2899 . . . . . . . . . 10 𝑛
10 nfcv 2899 . . . . . . . . . 10 𝑛 <
118, 9, 10nfinf 9398 . . . . . . . . 9 𝑛inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )
12 nfcv 2899 . . . . . . . . 9 𝑛
1311nfcsb1 3874 . . . . . . . . . 10 𝑛inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴
1413nfcri 2891 . . . . . . . . 9 𝑛 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴
15 csbeq1a 3865 . . . . . . . . . 10 (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝐴 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
1615eleq2d 2823 . . . . . . . . 9 (𝑛 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (𝑥𝐴𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
1711, 12, 14, 16elrabf 3645 . . . . . . . 8 (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴} ↔ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
187, 17sylib 218 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴 → (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ ∧ 𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴))
1918simpld 494 . . . . . 6 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℕ)
2018simprd 495 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴𝑥inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
2119nnred 12172 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℝ)
2221ltnrd 11279 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → ¬ inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
23 eliun 4952 . . . . . . . . 9 (𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵 ↔ ∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝑥𝐵)
2421ad2antrr 727 . . . . . . . . . . 11 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ∈ ℝ)
25 elfzouz 13591 . . . . . . . . . . . . . 14 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 ∈ (ℤ‘1))
2625, 2eleqtrrdi 2848 . . . . . . . . . . . . 13 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 ∈ ℕ)
2726ad2antlr 728 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ ℕ)
2827nnred 12172 . . . . . . . . . . 11 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ ℝ)
29 iundisj.1 . . . . . . . . . . . . . 14 (𝑛 = 𝑘𝐴 = 𝐵)
3029eleq2d 2823 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑥𝐴𝑥𝐵))
31 simpr 484 . . . . . . . . . . . . 13 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑥𝐵)
3230, 27, 31elrabd 3650 . . . . . . . . . . . 12 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴})
33 infssuzle 12856 . . . . . . . . . . . 12 (({𝑛 ∈ ℕ ∣ 𝑥𝐴} ⊆ (ℤ‘1) ∧ 𝑘 ∈ {𝑛 ∈ ℕ ∣ 𝑥𝐴}) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ≤ 𝑘)
343, 32, 33sylancr 588 . . . . . . . . . . 11 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) ≤ 𝑘)
35 elfzolt2 13596 . . . . . . . . . . . 12 (𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3635ad2antlr 728 . . . . . . . . . . 11 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → 𝑘 < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3724, 28, 24, 34, 36lelttrd 11303 . . . . . . . . . 10 (((∃𝑛 ∈ ℕ 𝑥𝐴𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))) ∧ 𝑥𝐵) → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))
3837rexlimdva2 3141 . . . . . . . . 9 (∃𝑛 ∈ ℕ 𝑥𝐴 → (∃𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝑥𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
3923, 38biimtrid 242 . . . . . . . 8 (∃𝑛 ∈ ℕ 𝑥𝐴 → (𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵 → inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) < inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4022, 39mtod 198 . . . . . . 7 (∃𝑛 ∈ ℕ 𝑥𝐴 → ¬ 𝑥 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)
4120, 40eldifd 3914 . . . . . 6 (∃𝑛 ∈ ℕ 𝑥𝐴𝑥 ∈ (inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵))
42 csbeq1 3854 . . . . . . . . 9 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝑚 / 𝑛𝐴 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) / 𝑛𝐴)
43 oveq2 7376 . . . . . . . . . 10 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → (1..^𝑚) = (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < )))
4443iuneq1d 4976 . . . . . . . . 9 (𝑚 = inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ) → 𝑘 ∈ (1..^𝑚)𝐵 = 𝑘 ∈ (1..^inf({𝑛 ∈ ℕ ∣ 𝑥𝐴}, ℝ, < ))𝐵)
4542, 44difeq12d 4081 . . . . . . . 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))
4645eleq2d 2823 . . . . . . 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)))
4746rspcev 3578 . . . . . 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))
4819, 41, 47syl2anc 585 . . . . 5 (∃𝑛 ∈ ℕ 𝑥𝐴 → ∃𝑚 ∈ ℕ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
49 nfv 1916 . . . . . 6 𝑚 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵)
50 nfcsb1v 3875 . . . . . . . 8 𝑛𝑚 / 𝑛𝐴
51 nfcv 2899 . . . . . . . 8 𝑛 𝑘 ∈ (1..^𝑚)𝐵
5250, 51nfdif 4083 . . . . . . 7 𝑛(𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)
5352nfcri 2891 . . . . . 6 𝑛 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)
54 csbeq1a 3865 . . . . . . . 8 (𝑛 = 𝑚𝐴 = 𝑚 / 𝑛𝐴)
55 oveq2 7376 . . . . . . . . 9 (𝑛 = 𝑚 → (1..^𝑛) = (1..^𝑚))
5655iuneq1d 4976 . . . . . . . 8 (𝑛 = 𝑚 𝑘 ∈ (1..^𝑛)𝐵 = 𝑘 ∈ (1..^𝑚)𝐵)
5754, 56difeq12d 4081 . . . . . . 7 (𝑛 = 𝑚 → (𝐴 𝑘 ∈ (1..^𝑛)𝐵) = (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
5857eleq2d 2823 . . . . . 6 (𝑛 = 𝑚 → (𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵)))
5949, 53, 58cbvrexw 3281 . . . . 5 (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑚 ∈ ℕ 𝑥 ∈ (𝑚 / 𝑛𝐴 𝑘 ∈ (1..^𝑚)𝐵))
6048, 59sylibr 234 . . . 4 (∃𝑛 ∈ ℕ 𝑥𝐴 → ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
61 eldifi 4085 . . . . 5 (𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) → 𝑥𝐴)
6261reximi 3076 . . . 4 (∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) → ∃𝑛 ∈ ℕ 𝑥𝐴)
6360, 62impbii 209 . . 3 (∃𝑛 ∈ ℕ 𝑥𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
64 eliun 4952 . . 3 (𝑥 𝑛 ∈ ℕ 𝐴 ↔ ∃𝑛 ∈ ℕ 𝑥𝐴)
65 eliun 4952 . . 3 (𝑥 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵) ↔ ∃𝑛 ∈ ℕ 𝑥 ∈ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
6663, 64, 653bitr4i 303 . 2 (𝑥 𝑛 ∈ ℕ 𝐴𝑥 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵))
6766eqriv 2734 1 𝑛 ∈ ℕ 𝐴 = 𝑛 ∈ ℕ (𝐴 𝑘 ∈ (1..^𝑛)𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1542  wcel 2114  wne 2933  wrex 3062  {crab 3401  csb 3851  cdif 3900  wss 3903  c0 4287   ciun 4948   class class class wbr 5100  cfv 6500  (class class class)co 7368  infcinf 9356  cr 11037  1c1 11039   < clt 11178  cle 11179  cn 12157  cuz 12763  ..^cfzo 13582
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-nul 5253  ax-pow 5312  ax-pr 5379  ax-un 7690  ax-cnex 11094  ax-resscn 11095  ax-1cn 11096  ax-icn 11097  ax-addcl 11098  ax-addrcl 11099  ax-mulcl 11100  ax-mulrcl 11101  ax-mulcom 11102  ax-addass 11103  ax-mulass 11104  ax-distr 11105  ax-i2m1 11106  ax-1ne0 11107  ax-1rid 11108  ax-rnegex 11109  ax-rrecex 11110  ax-cnre 11111  ax-pre-lttri 11112  ax-pre-lttrn 11113  ax-pre-ltadd 11114  ax-pre-mulgt0 11115
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-nel 3038  df-ral 3053  df-rex 3063  df-rmo 3352  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-tr 5208  df-id 5527  df-eprel 5532  df-po 5540  df-so 5541  df-fr 5585  df-we 5587  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-pred 6267  df-ord 6328  df-on 6329  df-lim 6330  df-suc 6331  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-riota 7325  df-ov 7371  df-oprab 7372  df-mpo 7373  df-om 7819  df-1st 7943  df-2nd 7944  df-frecs 8233  df-wrecs 8264  df-recs 8313  df-rdg 8351  df-er 8645  df-en 8896  df-dom 8897  df-sdom 8898  df-sup 9357  df-inf 9358  df-pnf 11180  df-mnf 11181  df-xr 11182  df-ltxr 11183  df-le 11184  df-sub 11378  df-neg 11379  df-nn 12158  df-n0 12414  df-z 12501  df-uz 12764  df-fz 13436  df-fzo 13583
This theorem is referenced by:  iunmbl  25522  volsup  25525  sigapildsys  34340  carsgclctunlem3  34498  voliunnfl  37915
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