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Frobenius theorem (real division algebras) : ウィキペディア英語版 | Frobenius theorem (real division algebras) In mathematics, more specifically in abstract algebra, the Frobenius theorem, proved by Ferdinand Georg Frobenius in 1877, characterizes the finite-dimensional associative division algebras over the real numbers. According to the theorem, every such algebra is isomorphic to one of the following: * (the real numbers) * (the complex numbers) * (the quaternions). These algebras have dimensions , and , respectively. Of these three algebras, and are commutative, but is not. ==Proof== The main ingredients for the following proof are the Cayley–Hamilton theorem and the fundamental theorem of algebra.
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