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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 7245 | . 2 ⊢ ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴 ⊔ 𝐵) | |
| 2 | eninl 7275 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → (inl “ 𝐴) ≈ 𝐴) | |
| 3 | 2 | 3ad2ant1 1042 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inl “ 𝐴) ≈ 𝐴) |
| 4 | eninr 7276 | . . . 4 ⊢ (𝐵 ∈ 𝑊 → (inr “ 𝐵) ≈ 𝐵) | |
| 5 | 4 | 3ad2ant2 1043 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inr “ 𝐵) ≈ 𝐵) |
| 6 | djuin 7242 | . . . 4 ⊢ ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅ | |
| 7 | 6 | a1i 9 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅) |
| 8 | simp3 1023 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ∩ 𝐵) = ∅) | |
| 9 | unen 6977 | . . 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 1272 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
| 11 | 1, 10 | eqbrtrrid 4119 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ w3a 1002 = wceq 1395 ∈ wcel 2200 ∪ cun 3195 ∩ cin 3196 ∅c0 3491 class class class wbr 4083 “ cima 4722 ≈ cen 6893 ⊔ cdju 7215 inlcinl 7223 inrcinr 7224 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-tr 4183 df-id 4384 df-iord 4457 df-on 4459 df-suc 4462 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-f1 5323 df-fo 5324 df-f1o 5325 df-fv 5326 df-1st 6292 df-2nd 6293 df-1o 6568 df-er 6688 df-en 6896 df-dju 7216 df-inl 7225 df-inr 7226 |
| This theorem is referenced by: djuenun 7405 dju0en 7407 exmidunben 13012 |
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