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The delta ``function'' (also Dirac delta function) [[File:hepa_img239.gif|33x24px]] is not a true function since it cannot be defined completely by giving the function value for all values of the argument ''X''. Similar to the [[Kronecker delta#144|Kronecker delta]], the notation [[File:hepa_img239.gif|33x24px]] stands for

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[[File:hepa_img240.gif|432x39px]]

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For any function ''F'':

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[[File:hepa_img241.gif|351x39px]]

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or in ''n'' dimensions:

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[[File:hepa_img242.gif|356x36px]]

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[[File:hepa_img239.gif|33x24px]] can also be defined as a normalized Gaussian function in the limit of zero width.

[[Category:W.Krisher and R.Bock]]
[[Category:Data analysis]]
[[Category:Statistics]]

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