Sigma (disambiguation)

This disambiguation page lists articles associated with the same or a similar title.

• Sigma (Greek letter) [r]: The 18th letter of the Greek alphabet, written as $\Sigma$ (upper-case) and $\sigma$ (lower-case), except at the end of a word, where the lower-case form is ς instead. ^[e]
• Sigma algebra [r]: A formal mathematical structure intended among other things to provide a rigid basis for measure theory and axiomatic probability theory. ^[e]
• Sigma function [r]: Add brief definition or description

• Series (mathematics) [r]: A sequence of numbers defined by the partial sums of another infinite sequence. ^[e]
• Sum-of-divisors function [r]: The function whose value is the sum of all positive divisors of a given positive integer. ^[e]