A question on Interval overlap.

The handout says "two intervals (a1,b1) and (a2,b2) overlap if a1<= a2 <= b1 or
a1 <= b2 <= b1 or both." Does overlap also occur if a2 <= a1 <= b2 or a2 <= b1
<= b2?

  Yes, it does. Mathematically, that's implied because the intervals (a1, b1)
  and (a2, b2) are otherwise unidentified (in other words (a1, b1) could have
  been (a2, b2) and vice versa), but I should have made it explicit.
Received on Sun Feb 11 2007 - 21:05:44 EST