The Kronecker delta reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Kronecker delta

In mathematics, the Kronecker delta is a function of two variables, which is 1 if they are equal, and 0 otherwise. It is written as the symbol δ_{i j}, and treated as a notational shorthand rather than a function.

It is named after mathematician Leopold Kronecker (1823-1891).

It is used in many areas of mathematics. For example, in linear algebra, the identity matrix can be written as:

( δ_{i j} )

See also Levi-Civita symbol, Dirac delta function.

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