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Mirrors > Home > ILE Home > Th. List > Mathboxes > bdeq0 | GIF version |
Description: Boundedness of the formula expressing that a setvar is equal to the empty class. (Contributed by BJ, 21-Nov-2019.) |
Ref | Expression |
---|---|
bdeq0 | ⊢ BOUNDED 𝑥 = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bdcnul 13063 | . . 3 ⊢ BOUNDED ∅ | |
2 | 1 | bdss 13062 | . 2 ⊢ BOUNDED 𝑥 ⊆ ∅ |
3 | 0ss 3401 | . . 3 ⊢ ∅ ⊆ 𝑥 | |
4 | eqss 3112 | . . 3 ⊢ (𝑥 = ∅ ↔ (𝑥 ⊆ ∅ ∧ ∅ ⊆ 𝑥)) | |
5 | 3, 4 | mpbiran2 925 | . 2 ⊢ (𝑥 = ∅ ↔ 𝑥 ⊆ ∅) |
6 | 2, 5 | bd0r 13023 | 1 ⊢ BOUNDED 𝑥 = ∅ |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ⊆ wss 3071 ∅c0 3363 BOUNDED wbd 13010 |
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-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-bd0 13011 ax-bdim 13012 ax-bdn 13015 ax-bdal 13016 ax-bdeq 13018 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-v 2688 df-dif 3073 df-in 3077 df-ss 3084 df-nul 3364 df-bdc 13039 |
This theorem is referenced by: bj-bd0el 13066 bj-nn0suc0 13148 |
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