closed interval
Mathematical term for an interval that includes its endpoints, often denoted with square brackets like [a, b]. Contrasts with 開区間 (open interval).
See also: 開区間
The closed interval from 0 to 1 includes 0 and 1.
この関数は閉区間で連続である。
This function is continuous on a closed interval.
Compound of 閉 (へい, 'closed') and 区間 (くかん, 'interval'), a straightforward technical term in mathematics.