half-open interval

(idea) by JerboaKolinowski Wed Jun 27 2001 at 21:16:23
Where a and b are real numbers, the set:
{x in R : a <= x < b}
is called a half-open interval on the real line, and may be written
[a, b).

Unlike an open interval, where neither the infimum nor the supremum are members of the set, and a closed interval, where both are, here the infimum is a member and the supremum is not.

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