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Mirrors > Home > ILE Home > Th. List > Mathboxes > bdciun | GIF version |
Description: The indexed union of a bounded class with a setvar indexing set is a bounded class. (Contributed by BJ, 16-Oct-2019.) |
Ref | Expression |
---|---|
bdciun.1 | ⊢ BOUNDED 𝐴 |
Ref | Expression |
---|---|
bdciun | ⊢ BOUNDED ∪ 𝑥 ∈ 𝑦 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bdciun.1 | . . . . 5 ⊢ BOUNDED 𝐴 | |
2 | 1 | bdeli 10637 | . . . 4 ⊢ BOUNDED 𝑧 ∈ 𝐴 |
3 | 2 | ax-bdex 10610 | . . 3 ⊢ BOUNDED ∃𝑥 ∈ 𝑦 𝑧 ∈ 𝐴 |
4 | 3 | bdcab 10640 | . 2 ⊢ BOUNDED {𝑧 ∣ ∃𝑥 ∈ 𝑦 𝑧 ∈ 𝐴} |
5 | df-iun 3680 | . 2 ⊢ ∪ 𝑥 ∈ 𝑦 𝐴 = {𝑧 ∣ ∃𝑥 ∈ 𝑦 𝑧 ∈ 𝐴} | |
6 | 4, 5 | bdceqir 10635 | 1 ⊢ BOUNDED ∪ 𝑥 ∈ 𝑦 𝐴 |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1433 {cab 2067 ∃wrex 2349 ∪ ciun 3678 BOUNDED wbdc 10631 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-4 1440 ax-17 1459 ax-ial 1467 ax-ext 2063 ax-bd0 10604 ax-bdex 10610 ax-bdsb 10613 |
This theorem depends on definitions: df-bi 115 df-clab 2068 df-cleq 2074 df-clel 2077 df-iun 3680 df-bdc 10632 |
This theorem is referenced by: (None) |
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