# Definition:Summation/Notation

## Notation for Summation

The sign $\sum$ is called **the summation sign** and sometimes referred to as **sigma** (as that is its name in Greek).

## Sources

- 1982: P.M. Cohn:
*Algebra Volume 1*(2nd ed.) ... (previous) ... (next): Chapter $2$: Integers and natural numbers: $\S 2.1$: The integers