Definitions for kronecker delta
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a function of two variables i and j that equals 1 when i=j and equals 0 otherwise
In mathematics, the Kronecker delta or Kronecker's delta, named after Leopold Kronecker, is a function of two variables, usually integers. The function is 1 if the variables are equal, and 0 otherwise: where Kronecker delta δij is a piecewise function of variables and . For example, δ1 2 = 0, whereas δ3 3 = 1. In linear algebra, the identity matrix can be written as and the inner product of vectors can be written as The Kronecker delta is used in many areas of mathematics.
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"kronecker delta." Definitions.net. STANDS4 LLC, 2014. Web. 21 Dec. 2014. <http://www.definitions.net/definition/kronecker delta>.