The notation [
a..
b] (or [
a) is the
closed interval
describing the set of values
a \(\leq\)
x \(\leq\)
b.
Similarly, the
open interval (
a..
b) (or (
a,
b))
describes the set of values
a \(<\)
x \(<\)
b. There are also
the
half-open (or
half-closed)
intervals
(
a..
b] and [
a..
b) (or (
a,
b] and [
a,) that represent the values
a \(<\)
x \(\leq\)
b and
a
\(\leq\)
x \(<\)
b respectivley.
This page last modified on 2006 January 24.