Sigma (disambiguation)

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

•  Sigma (Greek letter): 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: A formal mathematical structure intended among other things to provide a rigid basis for measure theory and axiomatic probability theory. ^[e]
• Sigma function: Add brief definition or description

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