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Concept
Sedenion
Summary
In abstract algebra, the sedenions form a 16-dimensional noncommutative and nonassociative algebra over the real numbers, usually represented by the capital letter S, boldface S or blackboard bold . They are obtained by applying the Cayley–Dickson construction to the octonions, and as such the octonions are isomorphic to a subalgebra of the sedenions. Unlike the octonions, the sedenions are not an alternative algebra. Applying the Cayley–Dickson construction to the sedenions yields a 32-dimensional algebra, sometimes called the 32-ions or trigintaduonions. It is possible to continue applying the Cayley–Dickson construction arbitrarily many times.
The term sedenion is also used for other 16-dimensional algebraic structures, such as a tensor product of two copies of the biquaternions, or the algebra of 4 × 4 matrices over the real numbers, or that studied by .
Like octonions, multiplication of sedenions is neither commutative nor associative.
But in contrast to the octonions, the sedenions do not even have the property of being alternative.
They do, however, have the property of power associativity, which can be stated as that, for any element x of , the power is well defined. They are also flexible.
Every sedenion is a linear combination of the unit sedenions , , , , ..., ,
which form a basis of the vector space of sedenions. Every sedenion can be represented in the form
Addition and subtraction are defined by the addition and subtraction of corresponding coefficients and multiplication is distributive over addition.
Like other algebras based on the Cayley–Dickson construction, the sedenions contain the algebra they were constructed from. So, they contain the octonions (generated by to in the table below), and therefore also the quaternions (generated by to ), complex numbers (generated by and ) and real numbers (generated by ).
The sedenions have a multiplicative identity element and multiplicative inverses, but they are not a division algebra because they have zero divisors.
Official source
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