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A matrix, viewed as a type of "number" . . . . . .
Square matrix . . . . . .
A Tessarine is a 2x2 matrix . . . . . .
Wikipedia: Tessarine
Fact archive: Matrix (mathematics), Matrix theory, Cayley-Hamilton theorem - The square n-by-n matrices with entries from the field K form a unitary associative algebra over K.
The webmaster and author of this Math Help site is Graeme McRae.