Stanley decomposition

From HandWiki

In commutative algebra, a Stanley decomposition is a way of writing a ring in terms of polynomial subrings. They were introduced by Richard Stanley (1982).

Definition

Suppose that a ring R is a quotient of a polynomial ring k[x1,...] over a field by some ideal. A Stanley decomposition of R is a representation of R as a direct sum (of vector spaces)

[math]\displaystyle{ R = \bigoplus_\alpha x_\alpha k(X_\alpha) }[/math]

where each xα is a monomial and each Xα is a finite subset of the generators.

See also

References

  • Stanley, Richard P. (1982), "Linear Diophantine equations and local cohomology", Invent. Math. 68 (2): 175–193, doi:10.1007/bf01394054 
  • Sturmfels, Bernd; White, Neil (1991), "Computing combinatorial decompositions of rings", Combinatorica 11 (3): 275–293, doi:10.1007/BF01205079