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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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