- 集合论 jíhélùn set theoryset theory in mathematics
- 子集合 zǐjíhé subset; subaggregate(math.) a subset or subaggregate; a set that is part of a larger set; also written [[子集|子集|zi3 ji2]]
- 空集合 kōngjíhé empty setA set in mathematics that contains no elements, often represented by the symbol ϕ
- 点集合 diǎnjíhé point set(mathematics) a collection of points; point set
- 集合体 jíhétǐ aggregatea group of items or people gathered together; ensemble; bundle
- 集合名词 jíhémíngcí collective nounA noun that refers to a group or collection of individuals or things, such as [[军队|軍隊|jun1 dui4]] or [[树林|樹林|shu4 lin2]]
- 整数集合 zhěngshùjíhé set of integers(mathematics) the set containing all positive and negative whole numbers and zero
- 零集合 língjíhé empty setthe set containing no elements
