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Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-bdcel | GIF version |
Description: Boundedness of a membership formula. (Contributed by BJ, 8-Dec-2019.) |
Ref | Expression |
---|---|
bj-bdcel.bd | ⊢ BOUNDED 𝑦 = 𝐴 |
Ref | Expression |
---|---|
bj-bdcel | ⊢ BOUNDED 𝐴 ∈ 𝑥 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-bdcel.bd | . . 3 ⊢ BOUNDED 𝑦 = 𝐴 | |
2 | 1 | ax-bdex 9939 | . 2 ⊢ BOUNDED ∃𝑦 ∈ 𝑥 𝑦 = 𝐴 |
3 | risset 2352 | . 2 ⊢ (𝐴 ∈ 𝑥 ↔ ∃𝑦 ∈ 𝑥 𝑦 = 𝐴) | |
4 | 2, 3 | bd0r 9945 | 1 ⊢ BOUNDED 𝐴 ∈ 𝑥 |
Colors of variables: wff set class |
Syntax hints: = wceq 1243 ∈ wcel 1393 ∃wrex 2307 BOUNDED wbd 9932 |
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-5 1336 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-4 1400 ax-ial 1427 ax-bd0 9933 ax-bdex 9939 |
This theorem depends on definitions: df-bi 110 df-clel 2036 df-rex 2312 |
This theorem is referenced by: bj-bd0el 9988 bj-bdsucel 10002 |
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