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A $\sigma$-algebra $\Sigma$ is a $\sigma$-ring with a unit.
Also known as
The term sigma-algebra can also be seen without the hyphen: sigma algebra.
Some sources refer to a sigma-algebra as a sigma-field
The $\sigma$ in $\sigma$-algebra is the Greek letter sigma which equates to the letter s.
$\sigma$ stands for for somme, which is French for union, and also summe, which is German for union.
- 1970: Avner Friedman: Foundations of Modern Analysis ... (previous) ... (next): $\S 1.1$: Rings and Algebras