[texhax] Question about Small \sum

[Leung Ngai-Hang Zachary]

Hi,

I've been using LaTeX for a year and a half, and recently I've come across
a \sum in a \[ ... \].  The interesting thing is that the \sum is small,
the same as it would be in text mode.  But, the i=0 to n is below and
above the \sum symbol.  How would I get that?  Thanks! =)

Zac