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Related theorems GIF version |
| Description: L.e. absorption. |
| Ref | Expression |
|---|---|
| leor | a ≤ (b ∪ a) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | leo 150 | . 2 a ≤ (a ∪ b) | |
| 2 | ax-a2 30 | . 2 (a ∪ b) = (b ∪ a) | |
| 3 | 1, 2 | lbtr 131 | 1 a ≤ (b ∪ a) |