This algorithm can be used to calculate not only intersection but also set-theoretic differences and union of two polygons .
该算法不仅可以求多边形的“交”，而且可以求多边形的“并”和“差”。
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
In particular, the thesis points out that the third method to show that all monomial space curves are set-theoretic complete intersections, thus simplifying the process to come to this conclusion.