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Mirrors > Home > ILE Home > Th. List > Mathboxes > bdcdif | GIF version |
Description: The difference of two bounded classes is bounded. (Contributed by BJ, 3-Oct-2019.) |
Ref | Expression |
---|---|
bdcdif.1 | ⊢ BOUNDED 𝐴 |
bdcdif.2 | ⊢ BOUNDED 𝐵 |
Ref | Expression |
---|---|
bdcdif | ⊢ BOUNDED (𝐴 ∖ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bdcdif.1 | . . . . 5 ⊢ BOUNDED 𝐴 | |
2 | 1 | bdeli 13843 | . . . 4 ⊢ BOUNDED 𝑥 ∈ 𝐴 |
3 | bdcdif.2 | . . . . . 6 ⊢ BOUNDED 𝐵 | |
4 | 3 | bdeli 13843 | . . . . 5 ⊢ BOUNDED 𝑥 ∈ 𝐵 |
5 | 4 | ax-bdn 13814 | . . . 4 ⊢ BOUNDED ¬ 𝑥 ∈ 𝐵 |
6 | 2, 5 | ax-bdan 13812 | . . 3 ⊢ BOUNDED (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵) |
7 | 6 | bdcab 13846 | . 2 ⊢ BOUNDED {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)} |
8 | df-dif 3123 | . 2 ⊢ (𝐴 ∖ 𝐵) = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)} | |
9 | 7, 8 | bdceqir 13841 | 1 ⊢ BOUNDED (𝐴 ∖ 𝐵) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∧ wa 103 ∈ wcel 2141 {cab 2156 ∖ cdif 3118 BOUNDED wbdc 13837 |
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-5 1440 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-4 1503 ax-17 1519 ax-ial 1527 ax-ext 2152 ax-bd0 13810 ax-bdan 13812 ax-bdn 13814 ax-bdsb 13819 |
This theorem depends on definitions: df-bi 116 df-clab 2157 df-cleq 2163 df-clel 2166 df-dif 3123 df-bdc 13838 |
This theorem is referenced by: bdcnulALT 13863 |
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