Description: Definition of the truth value "false", or "falsum", denoted by F. . See also df-tru . (Contributed by Anthony Hart, 22-Oct-2010)
Ref | Expression | ||
---|---|---|---|
Assertion | df-fal | ⊢ ( ⊥ ↔ ¬ ⊤ ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
0 | wfal | ⊢ ⊥ | |
1 | wtru | ⊢ ⊤ | |
2 | 1 | wn | ⊢ ¬ ⊤ |
3 | 0 2 | wb | ⊢ ( ⊥ ↔ ¬ ⊤ ) |