1 citations
- Temple CollegeUS2 papers
- Argonne National LaboratoryUS1 paper
- City College of New YorkUS1 paper
- Colorado State UniversityUS1 paper
- Los Alamos National LaboratoryUS1 paper
- University of California, IrvineUS1 paper
- University of California, Santa BarbaraUS1 paper
- University of Illinois Urbana-ChampaignUS1 paper
7 papers
Noncommutative Images of Commutative Spectra
Edward S. Letzter
We initiate a unified, axiomatic study of noncommutative algebras R whose prime spectra are, in a natural way, finite unions of commutative noetherian spectra. Our results illustra…
The Closed-Point Zariski Topology for Irreducible Representations
K. R. Goodearl, E. S. Letzter
In previous work, the second author introduced a topology, for spaces of irreducible representations, that reduces to the classical Zariski topology over commutative rings but prov…
Densities in free groups and , Visible Points and Test Elements
Ilya Kapovich, Igor Rivin, Paul Schupp +1
In this article we relate two different densities. Let be the free group of finite rank and let be the abelianization map from onto . We pr…
Commutator Hopf subalgebras and irreducible representations
Edward S. Letzter
S. Montgomery and S. Witherspoon proved that upper and lower semisolvable, semisimple, finite dimensional Hopf algebras are of Froebenius type when their dimensions are not divisib…
A Remark on Closed Noncommutative Subspaces
Edward S. Letzter
Given an abelian category with arbitrary products, arbitrary coproducts, and a generator, we show that the closed subspaces (in the sense of A. L. Rosenberg) are parameterized by a…
Surface area and other measures of ellipsoids
Igor Rivin
We begin by studying the surface area of an ellipsoid in n-dimensional Euclidean space as the function of the lengths of the semi-axes. We write down an explicit formula as an inte…