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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 7257 | . 2 ⊢ ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴 ⊔ 𝐵) | |
| 2 | eninl 7287 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → (inl “ 𝐴) ≈ 𝐴) | |
| 3 | 2 | 3ad2ant1 1042 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inl “ 𝐴) ≈ 𝐴) |
| 4 | eninr 7288 | . . . 4 ⊢ (𝐵 ∈ 𝑊 → (inr “ 𝐵) ≈ 𝐵) | |
| 5 | 4 | 3ad2ant2 1043 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inr “ 𝐵) ≈ 𝐵) |
| 6 | djuin 7254 | . . . 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 6986 | . . 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 4122 | 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 3196 ∩ cin 3197 ∅c0 3492 class class class wbr 4086 “ cima 4726 ≈ cen 6902 ⊔ cdju 7227 inlcinl 7235 inrcinr 7236 |
| 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 4202 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 |
| 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 2802 df-sbc 3030 df-csb 3126 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-tr 4186 df-id 4388 df-iord 4461 df-on 4463 df-suc 4466 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-1st 6298 df-2nd 6299 df-1o 6577 df-er 6697 df-en 6905 df-dju 7228 df-inl 7237 df-inr 7238 |
| This theorem is referenced by: djuenun 7417 dju0en 7419 exmidunben 13037 |
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