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:

    “It is the function of vice to keep virtue within reasonable bounds.”
    —Samuel Butler (1835–1902)