闭区间 (bìqūjiān): closed interval (mathematics)

Measure Word

一个闭区间 gè

Meanings

1 closed interval (mathematics)

Characters

Examples

函数在闭区间上连续。

Hánshù zài bìqūjiān shàng liánxù.

The function is continuous on the closed interval.

[0, 1] 是一个闭区间。

[líng, yī] shì yí gè bìqūjiān.

[0, 1] is a closed interval.

Tips

usage

In math, 闭区间 [a, b] includes both endpoints, while 开区间 (kāiqūjiān) (a, b) excludes them. The 闭/开 (closed/open) distinction mirrors English exactly.

Stroke Order

闭 bì

区 qū

间 jiān

Related Words

时间区间 shíjiānqūjiān

time interval / time range / time span

区间 qūjiān #68,735

interval / range / section (of a route)

闭包 bìbāo

closure (mathematics) — the smallest closed set containing a given set / closure (computer science) — a function bundled together with references to its surrounding state

闭集 bìjí

closed set (mathematics, topology)

闭子集 bìzǐjí

closed subset (mathematics, topology)

封闭 fēngbì HSK 4 #5,678

to close off / to seal / closed / isolated

闭门造车 bìménzàochē

to build a cart behind closed doors (idiom) / to work in isolation, out of touch with reality

闭口 bìkǒu

closed comedone (skincare) / small skin-colored bump under the skin, whitehead

闭 bì HSK 6 #431

to close; to shut / to obstruct; to block

时间间隔 shíjiānjiàngé

time interval