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Brahmagupta Identity
Definition
Let β congruent det B = x^2 - t y^2, where B is the Brahmagupta matrix, then det[B(x_1, y_1) B(x_2, y_2)] | = | det[B(x_1, y_1)] det[B(x_2, y_2)] | = | β_1 β_2].
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Associated person
Brahmagupta