Sedenions are an extension of the number system created through the Cayley-Dickson construction, which are 16-dimensional algebras over the real numbers. They are non-associative and exhibit unique properties, such as the existence of zero divisors and the lack of a normed division algebra structure, making them significantly different from their predecessors, such as quaternions and octonions. Understanding sedenions is essential in the study of non-associative rings and their properties, as they serve as an example of how algebraic structures can be extended while losing certain desirable characteristics.
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