> hypercomplex numbers i.e quaternion and octanion numbers, and no other valid numbering systems beyond that The term "hypercomplex number" refers to more than

> hypercomplex numbers i.e quaternion and octanion numbers, and no other valid numbering systems beyond that The term "hypercomplex number" refers to more than those examples. Those examples are the normed unital algebras, which are a finite subset of the hypercomplex numbers.