Sigma Function

In mathematics, by sigma function one can mean one of the following:

  • The sum-of-divisors function σa(n), an arithmetic function
  • Weierstrass sigma function, related to elliptic functions
  • Kronecker's sigma function
  • Rado's sigma function, see busy beaver

See also sigmoid function.

Famous quotes containing the word function:

    “The intension of a proposition comprises whatever the proposition entails: and it includes nothing else.... The connotation or intension of a function comprises all that attribution of this predicate to anything entails as also predicable to that thing.”
    —Clarence Lewis (1883–1964)