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Mirrors > Home > ILE Home > Th. List > unex | GIF version |
Description: The union of two sets is a set. Corollary 5.8 of [TakeutiZaring] p. 16. (Contributed by NM, 1-Jul-1994.) |
Ref | Expression |
---|---|
unex.1 | ⊢ 𝐴 ∈ V |
unex.2 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
unex | ⊢ (𝐴 ∪ 𝐵) ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unex.1 | . . 3 ⊢ 𝐴 ∈ V | |
2 | unex.2 | . . 3 ⊢ 𝐵 ∈ V | |
3 | 1, 2 | unipr 3594 | . 2 ⊢ ∪ {𝐴, 𝐵} = (𝐴 ∪ 𝐵) |
4 | prexgOLD 3946 | . . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝐴, 𝐵} ∈ V) | |
5 | 1, 2, 4 | mp2an 402 | . . 3 ⊢ {𝐴, 𝐵} ∈ V |
6 | 5 | uniex 4174 | . 2 ⊢ ∪ {𝐴, 𝐵} ∈ V |
7 | 3, 6 | eqeltrri 2111 | 1 ⊢ (𝐴 ∪ 𝐵) ∈ V |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1393 Vcvv 2557 ∪ cun 2915 {cpr 3376 ∪ cuni 3580 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pr 3944 ax-un 4170 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-rex 2312 df-v 2559 df-un 2922 df-sn 3381 df-pr 3382 df-uni 3581 |
This theorem is referenced by: unexb 4177 rdg0 5974 unen 6293 findcard2 6346 findcard2s 6347 ac6sfi 6352 nn0ex 8187 xrex 8756 |
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