Description: A /\ identity. (Contributed by Anthony Hart, 22-Oct-2010)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | falantru | |- ( ( F. /\ T. ) <-> F. ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fal | |- -. F. |
|
| 2 | 1 | intnanr | |- -. ( F. /\ T. ) |
| 3 | 2 | bifal | |- ( ( F. /\ T. ) <-> F. ) |