出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/02 20:42 UTC 版)
In linear algebra, the identity matrix or unit matrix of size n is the n×n square matrix with ones on the main diagonal and zeros elsewhere. It is denoted by In, or simply by I if the size is immaterial or can be trivially determined by the context. (In some fields, such as quantum mechanics, the identity matrix is denoted by a boldface one, 1; otherwise it is identical to I.)
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a wiseacre
a know-all
the multiplication of matrices
十進法.
10進法.
a method of identifying people by using their fingerprints
a theorem