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ブラーマグプタの二平方恒等式
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1. Brahmagupta–Fibonacci identity​In algebra, Brahmagupta's identity, also called Fibonacci's identity, implies that the product of two sums each 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. Specifically: For example, The identity is a special case (n = 1) of Lagrange's identity, and is first found in Diophantus.
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