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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 6952 | . 2 ⊢ ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴 ⊔ 𝐵) | |
2 | eninl 6982 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → (inl “ 𝐴) ≈ 𝐴) | |
3 | 2 | 3ad2ant1 1002 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inl “ 𝐴) ≈ 𝐴) |
4 | eninr 6983 | . . . 4 ⊢ (𝐵 ∈ 𝑊 → (inr “ 𝐵) ≈ 𝐵) | |
5 | 4 | 3ad2ant2 1003 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (inr “ 𝐵) ≈ 𝐵) |
6 | djuin 6949 | . . . 4 ⊢ ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅ | |
7 | 6 | a1i 9 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅) |
8 | simp3 983 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ∩ 𝐵) = ∅) | |
9 | unen 6710 | . . 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 1217 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
11 | 1, 10 | eqbrtrrid 3964 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ w3a 962 = wceq 1331 ∈ wcel 1480 ∪ cun 3069 ∩ cin 3070 ∅c0 3363 class class class wbr 3929 “ cima 4542 ≈ cen 6632 ⊔ cdju 6922 inlcinl 6930 inrcinr 6931 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-coll 4043 ax-sep 4046 ax-nul 4054 ax-pow 4098 ax-pr 4131 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-ral 2421 df-rex 2422 df-reu 2423 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-tr 4027 df-id 4215 df-iord 4288 df-on 4290 df-suc 4293 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-1st 6038 df-2nd 6039 df-1o 6313 df-er 6429 df-en 6635 df-dju 6923 df-inl 6932 df-inr 6933 |
This theorem is referenced by: djuenun 7068 dju0en 7070 exmidunben 11939 |
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