Brahmagupta–Fibonacci Identity
Frederic P. Miller, Agnes F. Vandome, John McBrewster
бумажная книга
High Quality Content by WIKIPEDIA articles! In algebra, Brahmagupta's identity, also sometimes called Fibonacci's identity, implies that the product of two sums of two squares is itself a sum of two squares. In other words, the set of all sums of two squares is closed under multiplication. The identity is a special case (n = 2) of Lagrange's identity.
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