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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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