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Mirrors > Home > ILE Home > Th. List > Mathboxes > bdfal | GIF version |
Description: The truth value ⊥ is bounded. (Contributed by BJ, 3-Oct-2019.) |
Ref | Expression |
---|---|
bdfal | ⊢ BOUNDED ⊥ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bdtru 13019 | . . 3 ⊢ BOUNDED ⊤ | |
2 | 1 | ax-bdn 13004 | . 2 ⊢ BOUNDED ¬ ⊤ |
3 | df-fal 1337 | . 2 ⊢ (⊥ ↔ ¬ ⊤) | |
4 | 2, 3 | bd0r 13012 | 1 ⊢ BOUNDED ⊥ |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ⊤wtru 1332 ⊥wfal 1336 BOUNDED wbd 12999 |
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-bd0 13000 ax-bdim 13001 ax-bdn 13004 ax-bdeq 13007 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-fal 1337 |
This theorem is referenced by: bdnth 13021 bj-axemptylem 13079 |
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