The Sigma reference article from the English Wikipedia on 24-Jul-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Sigma

People like you are child sponsors
  1. 
Sigma (upper case Σ, lower case σ, alternative ς) is a the Greek alphabet. See Sigma (letter).

  2. The upper-case letter Σ is used as a symbol for the summation operator forming a series in mathematics.

  3. The upper-case letter Σ is used as a symbol for a certain alphabet of a language, or of some other object dependent on an alphabet; expressed in mathematical terms, eg "the language defined by alphabet Σ={a,b,c} and the rules ..."

  4. The lower-case letter σ is used as a symbol for the standard deviation of a population in statistics.

  5. The lower-case letter σ is used as a symbol for the divisor function in number theory.

  6. The lower-case letter σ is used as a symbol for the Stefan-Boltzmann constant of radiation in physics.
    


This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.