On Mon, 21 Jul 2008 22:42:02 +0100, Jack <jj@[EMAIL PROTECTED]
>
wrote in <news:Io7hk.26541$gU4.12444@[EMAIL PROTECTED]
> in
alt.algebra.help:
[...]
> For union I have always been using \cup; is there
> something I need to know about the distinction between
> \cup and \bigcup?
\cup is the binary operator; \bigcup is to \cup as \sum is
to +.
> So for the cardinality of that union of sets, I can assume that the
union is
> itself a set and I write |\bigcup script-B(x, J)|?
You probably want
\left| \bigcup \mathcal{B}(x, J) \right|
or something of the sort, with automatic sizing of the
vertical bars.
|
