open interval

Noun

 * 1)  An interval in the real number line which does not contain its supremum and infimum. If specified by a pair of real numbers, then it consists of all the points on the real line whose values lie strictly between those two real numbers.

Translations

 * Chinese:
 * Mandarin:
 * Czech: otevřený interval
 * Korean: 열린구간, 개구간