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 state’s one function is to give.
    The bud must bloom till blowsy blown
    Its petals loosen and are strown;
    And that’s a fate it can’t evade
    Unless ‘twould rather wilt than fade.””
    —Robert Frost (1874–1963)