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| Mirrors > Home > QLE Home > Th. List > df-t | GIF version | ||
| Description: Define true. (Contributed by NM, 9-Aug-1997.) |
| Ref | Expression |
|---|---|
| df-t | 1 = (a ∪ a⊥ ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wt 8 | . 2 term 1 | |
| 2 | wva | . . 3 term a | |
| 3 | 2 | wn 4 | . . 3 term a⊥ |
| 4 | 2, 3 | wo 6 | . 2 term (a ∪ a⊥ ) |
| 5 | 1, 4 | wb 1 | 1 wff 1 = (a ∪ a⊥ ) |
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