| Mathbox for Anthony Hart |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nexfal | Structured version Visualization version GIF version | ||
| Description: There does not exist a set such that ⊥ is true. (Contributed by Anthony Hart, 13-Sep-2011.) |
| Ref | Expression |
|---|---|
| nexfal | ⊢ ¬ ∃𝑥⊥ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fal 1554 | . 2 ⊢ ¬ ⊥ | |
| 2 | 1 | nex 1800 | 1 ⊢ ¬ ∃𝑥⊥ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ⊥wfal 1552 ∃wex 1779 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 |
| This theorem depends on definitions: df-bi 207 df-tru 1543 df-fal 1553 df-ex 1780 |
| This theorem is referenced by: neufal 36407 mofal 36410 |
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