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| {{refimprove|date=August 2012}}
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| In mathematics, the following [[matrix (mathematics)|matrix]] was given by [[Indian mathematics|Indian mathematician]] [[Brahmagupta]]:<ref>{{cite web |url=http://www.fq.math.ca/Scanned/34-1/suryanarayan.pdf |title=The Brahmagupta polynomials |author= |date= |work=Suryanarayanan |publisher=The Fibonacci Quarterly |accessdate=3 November 2011}}</ref>
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| :<math>B(x,y) = \begin{bmatrix}
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| x & y \\
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| \pm ty & \pm x \end{bmatrix}.</math>
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| It satisfies
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| :<math>B(x_1,y_1) B(x_2,y_2) = B(x_1 x_2 \pm ty_1 y_2,x_1 y_2 \pm y_1 x_2).\,</math>
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| Powers of the matrix are defined by
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| :<math>B^n = \begin{bmatrix}
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| x & y \\
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| ty & x \end{bmatrix}^n = \begin{bmatrix}
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| x_n & y_n \\
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| ty_n & x_n \end{bmatrix} \equiv B_n.</math>
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| The <math>\ x_n</math> and <math>\ y_n</math> are called [[Brahmagupta polynomial]]s. The Brahmagupta matrices can be extended to [[negative number|negative]] [[integer]]s:
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| :<math>B^{-n} = \begin{bmatrix}
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| x & y \\
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| ty & x \end{bmatrix}^{-n} = \begin{bmatrix}
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| x_{-n} & y_{-n} \\
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| ty_{-n} & x_{-n} \end{bmatrix} \equiv B_{-n}.</math>
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| ==See also==
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| *[[Brahmagupta's identity]]
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| *[[Brahmagupta's function]]
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| ==References==
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| {{reflist}}
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| ==External links==
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| * Eric Weisstein. ''[http://mathworld.wolfram.com/BrahmaguptaMatrix.html Brahmagupta Matrix]'', [[MathWorld]], 1999.
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| *{{cite book |title=CRC Concise Encyclopedia of Mathematics |last=Weisstein |first=Eric W.|authorlink=Eric W. Weisstein|year=2003 |publisher=CRC Press |location=Florida |isbn=1-58488-347-2 |page=282}}
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| [[Category:Brahmagupta]]
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| [[Category:Matrices]]
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