#
nLab
nonassociative algebra

Contents
# Contents

## Definition

Let $k$ be a commutative unital ring, usually a field (but conceivably even a commutative rig).

A **nonassociative $k$-algebra** is a $k$-module $V$ equipped with a bilinear product $V\otimes V\to V$.

This product is typically neither associative nor unital, although it can be (an example of the red herring principle).

Mathematicians working in the field of nonassociative algebras often say simply ‘algebra’ meaning a nonassociative algebra.

## Examples

Some interesting subclasses are Lie algebra, Jordan algebra, Leibniz algebra, alternative algebra, associative unital algebra, composition algebra…

The octonions are a (slightly) non-associative real normed division algebra.

## References

- Richard D. Schafer,
*Introduction to Non-Associative Algebras*, Dover, New York, 1995. (pdf)

Last revised on April 21, 2017 at 07:42:45.
See the history of this page for a list of all contributions to it.