In
algebra
Algebra () is one of the areas of mathematics, broad areas of mathematics. Roughly speaking, algebra is the study of mathematical symbols and the rules for manipulating these symbols in formulas; it is a unifying thread of almost all of mathem ...
, a noncommutative Jordan algebra is an
algebra
Algebra () is one of the areas of mathematics, broad areas of mathematics. Roughly speaking, algebra is the study of mathematical symbols and the rules for manipulating these symbols in formulas; it is a unifying thread of almost all of mathem ...
, usually over a
field
Field may refer to:
Expanses of open ground
* Field (agriculture), an area of land used for agricultural purposes
* Airfield, an aerodrome that lacks the infrastructure of an airport
* Battlefield
* Lawn, an area of mowed grass
* Meadow, a grass ...
of
characteristic not 2, such that the four operations of left and right multiplication by ''x'' and ''x''
2 all commute with each other. Examples include
associative algebras and
Jordan algebra
In abstract algebra, a Jordan algebra is a nonassociative algebra over a field whose multiplication satisfies the following axioms:
# xy = yx (commutative law)
# (xy)(xx) = x(y(xx)) ().
The product of two elements ''x'' and ''y'' in a Jordan al ...
s.
Over fields of characteristic not 2, noncommutative Jordan algebras are the same as
flexible
Flexible may refer to:
Science and technology
* Power cord, a flexible electrical cable.
** Flexible cable, an Electrical cable as used on electrical appliances
* Flexible electronics
* Flexible response
* Flexible-fuel vehicle
* Flexible rake ...
Jordan-admissible algebras,
where a Jordan-admissible algebra – introduced by and named after
Pascual Jordan
Ernst Pascual Jordan (; 18 October 1902 – 31 July 1980) was a German theoretical and mathematical physicist who made significant contributions to quantum mechanics and quantum field theory. He contributed much to the mathematical form of matri ...
– is a (possibly
non-associative
In mathematics, the associative property is a property of some binary operations, which means that rearranging the parentheses in an expression will not change the result. In propositional logic, associativity is a valid rule of replacement f ...
) algebra that becomes a Jordan algebra under the product ''a'' ∘ ''b'' = ''ab'' + ''ba''.
See also
*
Malcev-admissible algebra In algebra, a Malcev-admissible algebra, introduced by , is a (possibly non-associative) algebra that becomes a Malcev algebra under the bracket 'a'', ''b''= ''ab'' − ''ba''. Examples include alternative algebras, Malcev algebr ...
*
Lie-admissible algebra In algebra, a Lie-admissible algebra, introduced by , is a (possibly non-associative) algebra that becomes a Lie algebra under the bracket 'a'', ''b''= ''ab'' − ''ba''. Examples include associative algebras, Lie algebras, and Okubo alg ...
References
*
*
*
{{refend
Non-associative algebra