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Mirrors > Home > ILE Home > Th. List > endjudisj | GIF version |
Description: Equinumerosity of a disjoint union and a union of two disjoint sets. (Contributed by Jim Kingdon, 30-Jul-2023.) |
Ref | Expression |
---|---|
endjudisj | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | djuun 7056 | . 2 ⊢ ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴 ⊔ 𝐵) | |
2 | eninl 7086 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → (inl “ 𝐴) ≈ 𝐴) | |
3 | 2 | 3ad2ant1 1018 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inl “ 𝐴) ≈ 𝐴) |
4 | eninr 7087 | . . . 4 ⊢ (𝐵 ∈ 𝑊 → (inr “ 𝐵) ≈ 𝐵) | |
5 | 4 | 3ad2ant2 1019 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inr “ 𝐵) ≈ 𝐵) |
6 | djuin 7053 | . . . 4 ⊢ ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅ | |
7 | 6 | a1i 9 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅) |
8 | simp3 999 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ∩ 𝐵) = ∅) | |
9 | unen 6806 | . . 3 ⊢ ((((inl “ 𝐴) ≈ 𝐴 ∧ (inr “ 𝐵) ≈ 𝐵) ∧ (((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴 ∪ 𝐵)) | |
10 | 3, 5, 7, 8, 9 | syl22anc 1239 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
11 | 1, 10 | eqbrtrrid 4034 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ w3a 978 = wceq 1353 ∈ wcel 2146 ∪ cun 3125 ∩ cin 3126 ∅c0 3420 class class class wbr 3998 “ cima 4623 ≈ cen 6728 ⊔ cdju 7026 inlcinl 7034 inrcinr 7035 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1445 ax-7 1446 ax-gen 1447 ax-ie1 1491 ax-ie2 1492 ax-8 1502 ax-10 1503 ax-11 1504 ax-i12 1505 ax-bndl 1507 ax-4 1508 ax-17 1524 ax-i9 1528 ax-ial 1532 ax-i5r 1533 ax-13 2148 ax-14 2149 ax-ext 2157 ax-coll 4113 ax-sep 4116 ax-nul 4124 ax-pow 4169 ax-pr 4203 ax-un 4427 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1459 df-sb 1761 df-eu 2027 df-mo 2028 df-clab 2162 df-cleq 2168 df-clel 2171 df-nfc 2306 df-ne 2346 df-ral 2458 df-rex 2459 df-reu 2460 df-rab 2462 df-v 2737 df-sbc 2961 df-csb 3056 df-dif 3129 df-un 3131 df-in 3133 df-ss 3140 df-nul 3421 df-pw 3574 df-sn 3595 df-pr 3596 df-op 3598 df-uni 3806 df-iun 3884 df-br 3999 df-opab 4060 df-mpt 4061 df-tr 4097 df-id 4287 df-iord 4360 df-on 4362 df-suc 4365 df-xp 4626 df-rel 4627 df-cnv 4628 df-co 4629 df-dm 4630 df-rn 4631 df-res 4632 df-ima 4633 df-iota 5170 df-fun 5210 df-fn 5211 df-f 5212 df-f1 5213 df-fo 5214 df-f1o 5215 df-fv 5216 df-1st 6131 df-2nd 6132 df-1o 6407 df-er 6525 df-en 6731 df-dju 7027 df-inl 7036 df-inr 7037 |
This theorem is referenced by: djuenun 7201 dju0en 7203 exmidunben 12394 |
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