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Mirrors > Home > ILE Home > Th. List > uniex | GIF version |
Description: The Axiom of Union in class notation. This says that if 𝐴 is a set i.e. 𝐴 ∈ V (see isset 2692), then the union of 𝐴 is also a set. Same as Axiom 3 of [TakeutiZaring] p. 16. (Contributed by NM, 11-Aug-1993.) |
Ref | Expression |
---|---|
uniex.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
uniex | ⊢ ∪ 𝐴 ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uniex.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | unieq 3745 | . . 3 ⊢ (𝑥 = 𝐴 → ∪ 𝑥 = ∪ 𝐴) | |
3 | 2 | eleq1d 2208 | . 2 ⊢ (𝑥 = 𝐴 → (∪ 𝑥 ∈ V ↔ ∪ 𝐴 ∈ V)) |
4 | uniex2 4358 | . . 3 ⊢ ∃𝑦 𝑦 = ∪ 𝑥 | |
5 | 4 | issetri 2695 | . 2 ⊢ ∪ 𝑥 ∈ V |
6 | 1, 3, 5 | vtocl 2740 | 1 ⊢ ∪ 𝐴 ∈ V |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 Vcvv 2686 ∪ cuni 3736 |
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-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-sep 4046 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rex 2422 df-v 2688 df-uni 3737 |
This theorem is referenced by: vuniex 4360 uniexg 4361 unex 4362 uniuni 4372 iunpw 4401 fo1st 6055 fo2nd 6056 brtpos2 6148 tfrexlem 6231 ixpsnf1o 6630 xpcomco 6720 xpassen 6724 pnfnre 7807 pnfxr 7818 |
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