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Mirrors > Home > ILE Home > Th. List > djuex | GIF version |
Description: The disjoint union of sets is a set. See also the more precise djuss 6948. (Contributed by AV, 28-Jun-2022.) |
Ref | Expression |
---|---|
djuex | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ⊔ 𝐵) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dju 6916 | . 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵)) | |
2 | p0ex 4107 | . . . . . . 7 ⊢ {∅} ∈ V | |
3 | 2 | a1i 9 | . . . . . 6 ⊢ (𝐵 ∈ 𝑊 → {∅} ∈ V) |
4 | 3 | anim1i 338 | . . . . 5 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐴 ∈ 𝑉) → ({∅} ∈ V ∧ 𝐴 ∈ 𝑉)) |
5 | 4 | ancoms 266 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({∅} ∈ V ∧ 𝐴 ∈ 𝑉)) |
6 | xpexg 4648 | . . . 4 ⊢ (({∅} ∈ V ∧ 𝐴 ∈ 𝑉) → ({∅} × 𝐴) ∈ V) | |
7 | 5, 6 | syl 14 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({∅} × 𝐴) ∈ V) |
8 | 1on 6313 | . . . . . . 7 ⊢ 1o ∈ On | |
9 | 8 | elexi 2693 | . . . . . 6 ⊢ 1o ∈ V |
10 | 9 | snex 4104 | . . . . 5 ⊢ {1o} ∈ V |
11 | 10 | a1i 9 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → {1o} ∈ V) |
12 | xpexg 4648 | . . . 4 ⊢ (({1o} ∈ V ∧ 𝐵 ∈ 𝑊) → ({1o} × 𝐵) ∈ V) | |
13 | 11, 12 | sylan 281 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({1o} × 𝐵) ∈ V) |
14 | unexg 4359 | . . 3 ⊢ ((({∅} × 𝐴) ∈ V ∧ ({1o} × 𝐵) ∈ V) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ∈ V) | |
15 | 7, 13, 14 | syl2anc 408 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ∈ V) |
16 | 1, 15 | eqeltrid 2224 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ⊔ 𝐵) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 1480 Vcvv 2681 ∪ cun 3064 ∅c0 3358 {csn 3522 Oncon0 4280 × cxp 4532 1oc1o 6299 ⊔ cdju 6915 |
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 2119 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-opab 3985 df-tr 4022 df-iord 4283 df-on 4285 df-suc 4288 df-xp 4540 df-1o 6306 df-dju 6916 |
This theorem is referenced by: djuexb 6922 updjud 6960 djudom 6971 exmidfodomrlemr 7051 exmidfodomrlemrALT 7052 djudoml 7068 djudomr 7069 exmidsbthrlem 13206 sbthom 13210 |
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