<P> Since individual outcomes may be of little practical interest , or because there may be prohibitively ( even infinitely ) many of them , outcomes are grouped into sets of outcomes that satisfy some condition , which are called `` events . '' The collection of all such events is a sigma - algebra . </P>
<P> Since individual outcomes may be of little practical interest , or because there may be prohibitively ( even infinitely ) many of them , outcomes are grouped into sets of outcomes that satisfy some condition , which are called `` events . '' The collection of all such events is a sigma - algebra . </P>
a collection of one or more outcomes is called an
a collection of one or more outcomes is called an
sets
sets