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Mirrors > Home > ILE Home > Th. List > Mathboxes > bdcint | GIF version |
Description: The intersection of a setvar is a bounded class. (Contributed by BJ, 16-Oct-2019.) |
Ref | Expression |
---|---|
bdcint | ⊢ BOUNDED ∩ 𝑥 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-bdel 9941 | . . . . 5 ⊢ BOUNDED 𝑦 ∈ 𝑧 | |
2 | 1 | ax-bdal 9938 | . . . 4 ⊢ BOUNDED ∀𝑧 ∈ 𝑥 𝑦 ∈ 𝑧 |
3 | df-ral 2311 | . . . 4 ⊢ (∀𝑧 ∈ 𝑥 𝑦 ∈ 𝑧 ↔ ∀𝑧(𝑧 ∈ 𝑥 → 𝑦 ∈ 𝑧)) | |
4 | 2, 3 | bd0 9944 | . . 3 ⊢ BOUNDED ∀𝑧(𝑧 ∈ 𝑥 → 𝑦 ∈ 𝑧) |
5 | 4 | bdcab 9969 | . 2 ⊢ BOUNDED {𝑦 ∣ ∀𝑧(𝑧 ∈ 𝑥 → 𝑦 ∈ 𝑧)} |
6 | df-int 3616 | . 2 ⊢ ∩ 𝑥 = {𝑦 ∣ ∀𝑧(𝑧 ∈ 𝑥 → 𝑦 ∈ 𝑧)} | |
7 | 5, 6 | bdceqir 9964 | 1 ⊢ BOUNDED ∩ 𝑥 |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∀wal 1241 {cab 2026 ∀wral 2306 ∩ cint 3615 BOUNDED wbdc 9960 |
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-17 1419 ax-ial 1427 ax-ext 2022 ax-bd0 9933 ax-bdal 9938 ax-bdel 9941 ax-bdsb 9942 |
This theorem depends on definitions: df-bi 110 df-clab 2027 df-cleq 2033 df-clel 2036 df-ral 2311 df-int 3616 df-bdc 9961 |
This theorem is referenced by: (None) |
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