Delta Function

Delta function may refer to the distribution:

  • Dirac delta function,

or the indexed matrix:

  • Kronecker delta, \delta_{ij} = \left\{\begin{matrix} 1, & \mbox{if } i=j \\ 0, & \mbox{if } i \ne j \end{matrix}\right.


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)