例文
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- This is a finite union of circles so has finite area.
- One is also allowed to take finite unions.
- Every projective algebraic set may be uniquely decomposed into a finite union of projective varieties.
- Similarly to algebraic subvarieties, finite unions and intersections of semialgebraic sets are still semialgebraic sets.
- A d-constructible set is a finite union of closed and open sets in the Kolchin topology.