   closed set whose complement has probability zero"</a>. MathWorld
          uses the word 'defined' for this range. Non-mathematicians might say it
          means the 'interesting' smallest range of random variate x that has the
          cdf going from zero to unity. Outside are uninteresting zones where the
          pdf is zero, and the cdf zero or unity.
        </p>
<p>
          For most distributions, with probability distribution functions one might
          describe as 'well-behaved', we have d