25 May
2011
25 May
'11
6:40 a.m.
Hi Joachim. According to wikipedia article http://en.wikipedia.org/wiki/Interval_(mathematics)#Classification_of_interv... we both are wrong. Just right_open or left_closed assume that the other end is unbounded.
(1) I tried to consider common usage of naming of intervals that is known from math. There seems to tendency to assume closedness as default, while openness is indicated by naming: [x, y] an interval (also closed interval) [x, y) a right open interval (x, y] a left open interval (x, y) an open interval.