> [!definition] Relativity > > An event is something that happens at one [[Position|position]] and at a given time. > [!definition] Probability > > An event $E$ is a subset of a given [[Sample Space|sample space]] $S$. It is *simple* if it contains only one outcome ($n(E) = 1$), and *compound* if it contains more than one outcome ($n(E) > 1$).