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Re: integrals

>Can somebody tell me why there is a small integral in cmex, and in cmsy.
>\int refers to the one in cmex.

It's used in areas of mathematics where integration is seen as a
function from a set to a number, so:
   \smallint\{e_i \mid i \in I}
rather than:
   \int_{i \in I} e_i
Similarly, some mathematicians use \Sigma and \Pi rather than \sum and
\prod.  (Jeremy, have you got references for this usage, this is your
sort of field?)