闭集

閉集

bìjí

noun

Meanings

1 closed set (mathematics, topology)

Characters

Examples

HSK 6

闭集的补集是开集。

Bìjí de bǔjí shì kāijí.

The complement of a closed set is an open set.

HSK 7-9

闭区间是实数轴上的闭集。

Bìqūjiān shì shíshù zhóu shàng de bìjí.

A closed interval is a closed set on the real number line.

Tips

memory

Pair: 开集 ('open set') / 闭集 ('closed set'). The 集 ('set') series is highly productive in math Chinese - 子集 (subset), 空集 (empty set), 并集 (union), 交集 (intersection).

Stroke Order

闭 bì

集 jí