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| Mirrors > Home > QLE Home > Th. List > df-le2 | GIF version | ||
| Description: Define "less than or equal to". See df-le1 130 for the other direction. (Contributed by NM, 27-Aug-1997.) |
| Ref | Expression |
|---|---|
| df-le2.1 | a ≤ b |
| Ref | Expression |
|---|---|
| df-le2 | (a ∪ b) = b |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wva | . . 3 term a | |
| 2 | wvb | . . 3 term b | |
| 3 | 1, 2 | wo 6 | . 2 term (a ∪ b) |
| 4 | 3, 2 | wb 1 | 1 wff (a ∪ b) = b |
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