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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 10561). (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 487 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → 𝐴 ≼ ω) | |
| 3 | ctex 8961 | . . . . . . 7 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 4 | 3 | adantr 485 | . . . . . 6 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → 𝐴 ∈ V) |
| 5 | ovex 7445 | . . . . . . 7 ⊢ (ω ↑m 𝐵) ∈ V | |
| 6 | 5 | rgenw 3083 | . . . . . 6 ⊢ ∀𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V |
| 7 | iunexg 7961 | . . . . . 6 ⊢ ((𝐴 ∈ V ∧ ∀𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) | |
| 8 | 4, 6, 7 | sylancl 597 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ V) |
| 9 | acncc 10425 | . . . . 5 ⊢ AC ω = V | |
| 10 | 8, 9 | eleqtrrdi 2874 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 (ω ↑m 𝐵) ∈ AC ω) |
| 11 | acndom 10036 | . . . 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 489 | . . 3 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) | |
| 14 | omex 9613 | . . . . . 6 ⊢ ω ∈ V | |
| 15 | xpdom1g 9063 | . . . . . 6 ⊢ ((ω ∈ V ∧ 𝐴 ≼ ω) → (𝐴 × ω) ≼ (ω × ω)) | |
| 16 | 14, 2, 15 | sylancr 598 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → (𝐴 × ω) ≼ (ω × ω)) |
| 17 | xpomen 10000 | . . . . 5 ⊢ (ω × ω) ≈ ω | |
| 18 | domentr 9011 | . . . . 5 ⊢ (((𝐴 × ω) ≼ (ω × ω) ∧ (ω × ω) ≈ ω) → (𝐴 × ω) ≼ ω) | |
| 19 | 16, 17, 18 | sylancl 597 | . . . 4 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → (𝐴 × ω) ≼ ω) |
| 20 | ctex 8961 | . . . . . . 7 ⊢ (𝐵 ≼ ω → 𝐵 ∈ V) | |
| 21 | 20 | ralimi 3102 | . . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ≼ ω → ∀𝑥 ∈ 𝐴 𝐵 ∈ V) |
| 22 | iunexg 7961 | . . . . . 6 ⊢ ((𝐴 ∈ V ∧ ∀𝑥 ∈ 𝐴 𝐵 ∈ V) → ∪ 𝑥 ∈ 𝐴 𝐵 ∈ V) | |
| 23 | 3, 21, 22 | syl2an 607 | . . . . 5 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ∈ V) |
| 24 | omelon 9616 | . . . . . 6 ⊢ ω ∈ On | |
| 25 | onenon 9936 | . . . . . 6 ⊢ (ω ∈ On → ω ∈ dom card) | |
| 26 | 24, 25 | ax-mp 5 | . . . . 5 ⊢ ω ∈ dom card |
| 27 | numacn 10034 | . . . . 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 10039 | . . . 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 10526 | . 2 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ (𝐴 × ω)) |
| 32 | domtr 9005 | . 2 ⊢ ((∪ 𝑥 ∈ 𝐴 𝐵 ≼ (𝐴 × ω) ∧ (𝐴 × ω) ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ ω) | |
| 33 | 31, 19, 32 | syl2anc 595 | 1 ⊢ ((𝐴 ≼ ω ∧ ∀𝑥 ∈ 𝐴 𝐵 ≼ ω) → ∪ 𝑥 ∈ 𝐴 𝐵 ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2143 ∀wral 3079 Vcvv 3455 {csn 4590 ∪ ciun 4957 class class class wbr 5110 × cxp 5661 dom cdm 5663 Oncon0 6362 (class class class)co 7412 ωcom 7863 ↑m cmap 8825 ≈ cen 8941 ≼ cdom 8942 cardccrd 9922 AC wacn 9925 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5239 ax-sep 5258 ax-nul 5270 ax-pow 5338 ax-pr 5406 ax-un 7734 ax-inf2 9611 ax-cc 10420 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-isom 6547 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8279 df-wrecs 8310 df-recs 8359 df-rdg 8398 df-1o 8454 df-er 8695 df-map 8827 df-en 8945 df-dom 8946 df-sdom 8947 df-fin 8948 df-oi 9473 df-card 9926 df-acn 9929 |
| This theorem is referenced by: unictb 10561 iunctb2 38027 heiborlem3 38442 |
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