This algebra is exploited by a cost-based optimizer that can freely mix regular and compression-aware operators.
该代数由基于成本的优化器使用，该优化器能够自由混合使用常规运算符以及与压缩有关的运算符。
2
Using the knowledge of abstract algebra, the rotation groups of the regular polyhedron are determined.
通过抽象代数知识，求出所有正多面体的旋转群。
3
The structure of the idempotent elements, regular elements and maximal subgroups and the number of the idempotent elements and regular elements in Boolean group algebra are given.