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Kronecker delta

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noun Mathematics.

a function of two variables, i and j, which equals 1 when the variables have the same value, i = j, and equals 0 when the variables have different values, i ≠ j.

Origin:
1925–30; named after L. Kronecker

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Kronecker delta is always a great word to know.

So is proportion. Does it mean:

to take one number or quantity from another; deduct

a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios

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Collins

World English Dictionary

Kronecker delta (ˈkrɒnɪkə)

—n
	maths δ_ij a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity

[named after Leopold Kronecker (1823--91), German mathematician]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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