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Mirrors > Home > MPE Home > Th. List > endjudisj | Structured version Visualization version GIF version |
Description: Equinumerosity of a disjoint union and a union of two disjoint sets. (Contributed by NM, 5-Apr-2007.) |
Ref | Expression |
---|---|
endjudisj | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dju 9659 | . 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵)) | |
2 | 0ex 5231 | . . . . . 6 ⊢ ∅ ∈ V | |
3 | xpsnen2g 8852 | . . . . . 6 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ 𝑉) → ({∅} × 𝐴) ≈ 𝐴) | |
4 | 2, 3 | mpan 687 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({∅} × 𝐴) ≈ 𝐴) |
5 | 1on 8309 | . . . . . 6 ⊢ 1o ∈ On | |
6 | xpsnen2g 8852 | . . . . . 6 ⊢ ((1o ∈ On ∧ 𝐵 ∈ 𝑊) → ({1o} × 𝐵) ≈ 𝐵) | |
7 | 5, 6 | mpan 687 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → ({1o} × 𝐵) ≈ 𝐵) |
8 | 4, 7 | anim12i 613 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵)) |
9 | xp01disjl 8322 | . . . . 5 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ | |
10 | 9 | jctl 524 | . . . 4 ⊢ ((𝐴 ∩ 𝐵) = ∅ → ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) |
11 | unen 8836 | . . . 4 ⊢ (((({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵) ∧ ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) | |
12 | 8, 10, 11 | syl2an 596 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
13 | 12 | 3impa 1109 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
14 | 1, 13 | eqbrtrid 5109 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 Vcvv 3432 ∪ cun 3885 ∩ cin 3886 ∅c0 4256 {csn 4561 class class class wbr 5074 × cxp 5587 Oncon0 6266 1oc1o 8290 ≈ cen 8730 ⊔ cdju 9656 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3434 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-ord 6269 df-on 6270 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-1st 7831 df-2nd 7832 df-1o 8297 df-er 8498 df-en 8734 df-dju 9659 |
This theorem is referenced by: djuenun 9926 dju0en 9931 ficardun 9956 ficardunOLD 9957 ackbij1lem9 9984 canthp1lem1 10408 |
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