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Encyclopedia > Sedenion

The sedenions form a 16-dimensional algebra over the reals obtained by applying the Cayley-Dickson construction to the octonions.


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 being power-associative.


The sedenions have a multiplicative identity element 1 and multiplicative inverses, but they are not a division algebra. This is because they have zero divisors.


Every sedenion is a real linear combination of the unit sedenions 1, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14 and e15, which form a basis of the vector space of sedenions. The multiplication table of these unit sedenions looks as follows.

× 1
e1
e2
e3
e4
e5
e6
e7
e8
e9
e10
e11
e12
e13
e14
e15
1
1
e1
e2
e3
e4
e5
e6
e7
e8
e9
e10
e11
e12
e13
e14
e15
e1
e1
-1
e3
-e2
e5
-e4
-e7
e6
e9
-e8
-e11
e10
-e13
e12
e15
-e14
e2
e2
-e3
-1
e1
e6
e7
-e4
-e5
e10
e11
-e8
-e9
-e14
-e15
e12
e13
e3
e3
e2
-e1
-1
e7
-e6
e5
-e4
e11
-e10
e9
-e8
-e15
e14
-e13
e12
e4
e4
-e5
-e6
-e7
-1
e1
e2
e3
e12
e13
e14
e15
-e8
-e9
-e10
-e11
e5
e5
e4
-e7
e6
-e1
-1
-e3
e2
e13
-e12
e15
-e14
e9
-e8
e11
-e10
e6
e6
e7
e4
-e5
-e2
e3
-1
-e1
e14
-e15
-e12
e13
e10
-e11
-e8
e9
e7
e7
-e6
e5
e4
-e3
-e2
e1
-1
e15
e14
-e13
-e12
e11
e10
-e9
-e8
e8
e8
-e9
-e10
-e11
-e12
-e13
-e14
-e15
-1
e1
e2
e3
e4
e5
e6
e7
e9
e9
e8
-e11
e10
-e13
e12
e15
-e14
-e1
-1
-e3
e2
-e5
e4
e7
-e6
e10
e10
e11
e8
-e9
-e14
-e15
e12
e13
-e2
e3
-1
-e1
-e6
-e7
e4
e5
e11
e11
-e10
e9
e8
-e15
e14
-e13
e12
-e3
-e2
e1
-1
-e7
e6
-e5
e4
e12
e12
e13
e14
e15
e8
-e9
-e10
-e11
-e4
e5
e6
e7
-1
-e1
-e2
-e3
e13
e13
-e12
e15
-e14
e9
e8
e11
-e10
-e5
-e4
e7
-e6
e1
-1
e3
-e2
e14
e14
-e15
-e12
e13
e10
-e11
e8
e9
-e6
-e7
-e4
e5
e2
-e3
-1
e1
e15
e15
e14
-e13
-e12
e11
e10
-e9
e8
-e7
e6
-e5
-e4
e3
e2
-e1
-1

Further reading

  • Carmody, Kevin: Circular and Hyperbolic Quaternions, Octonions and Sedenions, Applied Mathematics and Computation 28:47-72 (1988)
  • Carmody, Kevin: Circular and Hyperbolic Quaternions, Octonions and Sedenions - Further results, Applied Mathematics and Computation, 84:27-47 (1997)
  • Imaeda, K., Imaeda, M.: Sedenions: algebra and analysis, Applied Mathematics and Computation, 115:77-88 (2000)

Topics in mathematics related to quantity

Numbers | Natural numbers | Integers | Rational numbers | Constructible numbers | Algebraic numbers | Computable numbers | Real numbers | Complex numbers | Split-complex numbers | Bicomplex numbers | Hypercomplex numbers | Quaternions | Octonions | Sedenions | Superreal numbers | Hyperreal numbers | Surreal numbers | Nominal numbers | Ordinal numbers | Cardinal numbers | p-adic numbers | Integer sequences | Mathematical constants | Large numbers | Infinity

  Results from FactBites:
 
Sedenion - encyclopedia article about Sedenion. (720 words)
The sedenions form a 16-dimensional algebra algebra over a field K, or a K-algebra, is a vector space A over K equipped with a compatible notion of multiplication of elements of A.
But in contrast to the octonions, the sedenions do not even have the property of being alternative In abstract algebra, an algebra is called alternative if (xx)y=x(xy) and y(xx)=(yx)x for all x and y in the algebra, that is, if the multiplication is alternative.
The sedenions have a multiplicative identity element identity element (or neutral element) is a special type of element of a set with respect to a binary operation on that set.
  More results at FactBites »


 

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