13,119 research outputs found
Regular orbit closures in module varieties
Let A be a finitely generated associative algebra over an algebraically
closed field. We characterize the finite dimensional modules over A whose orbit
closures are regular varieties.Comment: 11 page
Toric ideals of normalized graph algebras
A graph-theoretic method, simpler than existing ones, is used to characterize
the minimal set of monomial generators for the integral closure of any algebra
of polynomials generated by quadratic monomials. The toric ideal of relations
between these generators is generated by a set of binomials, defined
graphically. The spectra of the original algebra and of its integral closure
turn out to be canonically homeomorphic.Comment: 9 pages, no figures. v2: major rewrite. v3: minor improvements. v4:
new title, old reference located, other small change
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