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| Mirrors > Home > MPE Home > Th. List > iunctb | Structured version Visualization version GIF version | ||
| Description: The countable union of countable sets is countable (indexed union version of unictb 10687). (Contributed by Mario Carneiro, 18-Jan-2014.) |
| Ref | Expression |
|---|---|
| iunctb | ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . . 3 ⊢ ∪ 𝑥 ∈ 𝐴 ({𝑥} × 𝐵) = ∪ 𝑥 ∈ 𝐴 ({𝑥} × 𝐵) | |
| 2 | simpl 488 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → 𝐴 ≼ ω) | |
| 3 | ctex 9018 | . . . . . . 7 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 4 | 3 | adantr 486 | . . . . . 6 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → 𝐴 ∈ V) |
| 5 | ovex 7476 | . . . . . . 7 ⊢ (ω ↑m 𝐵) ∈ V | |
| 6 | 5 | rgenw 3084 | . . . . . 6 ⊢ ∀𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V |
| 7 | iunexg 7999 | . . . . . 6 ⊢ ((𝐴 ∈ V ∧ ∀𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) | |
| 8 | 4, 6, 7 | sylancl 598 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) |
| 9 | acncc 10545 | . . . . 5 ⊢ AC ω = V | |
| 10 | 8, 9 | eleqtrrdi 2875 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ AC ω) |
| 11 | acndom 10157 | . . . 4 ⊢ (𝐴 ≼ ω → (∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ AC ω → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ AC 𝐴)) | |
| 12 | 2, 10, 11 | sylc 66 | . . 3 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ AC 𝐴) |
| 13 | simpr 490 | . . 3 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) | |
| 14 | omex 9671 | . . . . . 6 ⊢ ω ∈ V | |
| 15 | xpdom1g 9121 | . . . . . 6 ⊢ ((ω ∈ V ∧ 𝐴 ≼ ω) → (𝐴 × ω) ≼ (ω × ω)) | |
| 16 | 14, 2, 15 | sylancr 599 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → (𝐴 × ω) ≼ (ω × ω)) |
| 17 | xpomen 10121 | . . . . 5 ⊢ (ω × ω) ≈ ω | |
| 18 | domentr 9068 | . . . . 5 ⊢ (((𝐴 × ω) ≼ (ω × ω) ∧ (ω × ω) ≈ ω) → (𝐴 × ω) ≼ ω) | |
| 19 | 16, 17, 18 | sylancl 598 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → (𝐴 × ω) ≼ ω) |
| 20 | ctex 9018 | . . . . . . 7 ⊢ (𝐵 ≼ ω → 𝐵 ∈ V) | |
| 21 | 20 | ralimi 3103 | . . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ≼ ω → ∀𝑥 ∈ 𝐴 𝐵 ∈ V) |
| 22 | iunexg 7999 | . . . . . 6 ⊢ ((𝐴 ∈ V ∧ ∀𝑥 ∈ 𝐴 𝐵 ∈ V) → ∪ 𝑥 ∈ 𝐴 𝐵 ∈ V) | |
| 23 | 3, 21, 22 | syl2an 608 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ∈ V) |
| 24 | omelon 9674 | . . . . . 6 ⊢ ω ∈ On | |
| 25 | onenon 10057 | . . . . . 6 ⊢ (ω ∈ On → ω ∈ dom card) | |
| 26 | 24, 25 | ax-mp 5 | . . . . 5 ⊢ ω ∈ dom card |
| 27 | numacn 10155 | . . . . 5 ⊢ (∪ 𝑥 ∈ 𝐴 𝐵 ∈ V → (ω ∈ dom card → ω ∈ AC ∪ 𝑥 ∈ 𝐴 𝐵)) | |
| 28 | 23, 26, 27 | mpisyl 22 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ω ∈ AC ∪ 𝑥 ∈ 𝐴 𝐵) |
| 29 | acndom2 10160 | . . . 4 ⊢ ((𝐴 × ω) ≼ ω → (ω ∈ AC ∪ 𝑥 ∈ 𝐴 𝐵 → (𝐴 × ω) ∈ AC ∪ 𝑥 ∈ 𝐴 𝐵)) | |
| 30 | 19, 28, 29 | sylc 66 | . . 3 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → (𝐴 × ω) ∈ AC ∪ 𝑥 ∈ 𝐴 𝐵) |
| 31 | 1, 12, 13, 30 | iundomg 10652 | . 2 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ (𝐴 × ω)) |
| 32 | domtr 9062 | . 2 ⊢ ((∪ 𝑥 ∈ 𝐴 𝐵 ≼ (𝐴 × ω) ∧ (𝐴 × ω) ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ ω) | |
| 33 | 31, 19, 32 | syl2anc 596 | 1 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ ω) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2147 ∀wral 3080 Vcvv 3454 {csn 4588 ∪ ciun 4954 class class class wbr 5106 × cxp 5653 dom cdm 5655 Oncon0 6380 (class class class)co 7443 ωcom 7901 ↑m cmap 8875 ≈ cen 8998 ≼ cdom 8999 cardccrd 10043 AC wacn 10046 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5235 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-inf2 9669 ax-cc 10540 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-se 5609 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-isom 6567 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-om 7902 df-1st 8025 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-1o 8504 df-er 8745 df-map 8877 df-en 9002 df-dom 9003 df-sdom 9004 df-fin 9005 df-oi 9531 df-card 10047 df-acn 10050 |
| This theorem is used by: unictb 10687 iunctb2 38518 heiborlem3 38939 |
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