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Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-unex | GIF version |
Description: unex 4419 from bounded separation. (Contributed by BJ, 13-Nov-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-unex.1 | ⊢ 𝐴 ∈ V |
bj-unex.2 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
bj-unex | ⊢ (𝐴 ∪ 𝐵) ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-unex.1 | . . 3 ⊢ 𝐴 ∈ V | |
2 | bj-unex.2 | . . 3 ⊢ 𝐵 ∈ V | |
3 | 1, 2 | unipr 3803 | . 2 ⊢ ∪ {𝐴, 𝐵} = (𝐴 ∪ 𝐵) |
4 | bj-prexg 13793 | . . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝐴, 𝐵} ∈ V) | |
5 | 1, 2, 4 | mp2an 423 | . . 3 ⊢ {𝐴, 𝐵} ∈ V |
6 | 5 | bj-uniex 13799 | . 2 ⊢ ∪ {𝐴, 𝐵} ∈ V |
7 | 3, 6 | eqeltrri 2240 | 1 ⊢ (𝐴 ∪ 𝐵) ∈ V |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2136 Vcvv 2726 ∪ cun 3114 {cpr 3577 ∪ cuni 3789 |
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 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-pr 4187 ax-un 4411 ax-bd0 13695 ax-bdor 13698 ax-bdex 13701 ax-bdeq 13702 ax-bdel 13703 ax-bdsb 13704 ax-bdsep 13766 |
This theorem depends on definitions: df-bi 116 df-tru 1346 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-rex 2450 df-v 2728 df-un 3120 df-sn 3582 df-pr 3583 df-uni 3790 df-bdc 13723 |
This theorem is referenced by: bdunexb 13802 bj-unexg 13803 |
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