This article is about free algebras in ring theory. For the more general free algebras in universal algebra, see free object. In mathematics, especially in the area of abstract algebra known as ring theory, a free algebra is the noncommutative analogue of a polynomial ring (which may be regarded as a free commutative algebra).


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For R a commutative ring, the free (associative, unital) algebra on n indeterminates, {X1, ..., Xn}, is the ring spanned by all sums of products of the variables. This ring is denoted R〈X1, ..., Xn〉. With the obvious scalar multiplication R〈X1, ..., Xn〉 forms an algebra over R. Unlike in a polynomial ring, the variables do not commute. For example X1X2 does not equal X2X1.


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More generally, one can construct the free algebra R〈E〉 on any set E of generators. Since rings may be regarded as Z-algebras, a free ring on E can be defined as the free algebra Z〈E〉.


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Over a field, the free algebra on n indeterminates can be constructed as the tensor algebra on an n-dimensional vector space. For a more general coefficient ring, the same construction works if we take the free module on n generators.


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For the more general free algebras in universal algebra, see free object. ... Since rings may be regarded as Z-algebras, a free ring on E can be defined as the free algebra Z〈E〉 ...
The construction of the free algebra on E is functorial in nature and satisfies an appropriate universal property. The free algebra functor is left adjoint to the forgetful functor from the category of R-algebras to the category of sets.


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Free algebras over division rings are free ideal rings. See also Tensor algebra Free object Noncommutative ring References L.A. Bokut' (2001), "Free associative algebra", in Hazewinkel, Michiel, Encyclopaedia of Mathematics, Springer, ISBN 978-1556080104, http://eom.springer.de/f/f041520.htm 


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