# Definition:Elementary Event

## Definition

Let $\mathcal E$ be an experiment.

An **elementary event** of $\mathcal E$, often denoted $\omega$ (Greek lowercase **omega**) is one of the elements of the sample space $\Omega$ (Greek capital **omega**) of $\mathcal E$.

## Also known as

An **elementary event** is one of the possible **outcomes** of $\mathcal E$.

Thus **outcome** means the same thing as **elementary event**.

## Sources

- 1986: Geoffrey Grimmett and Dominic Welsh:
*Probability: An Introduction*... (previous) ... (next): $\S 1.2$: Outcomes and events