Definition von open interval im Englisch Englisch wörterbuch
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
An interval in the real line which contains one of its endpoints but not the other one: i.e., it either contains its supremum or its infimum but not both