For example, Clojure has a delightful implementation of sets and operations on sets, as well as some quasi-relational algebra thrown in for good measure.
例如，Clojure有一个友好的Set及Set操作实现，以及一些准关系代数实现。
2
When there is a positive measure on Boole algebra? This problem had more complete results, but they require some set-theoretic hypothesis usually.
布尔代数上何时存在正测度的问题，虽已有相对完整的结果，但多附有一些集论的假设条件。
3
It can be used by selecting the absolute value or the sum of algebra and one way to measure active power, and.