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6 papers · 1 filter
Fixed points and excedances in restricted permutations
Sergi Elizalde
In this paper we prove that among the permutations of length n with i fixed points and j excedances, the number of 321-avoiding ones equals the number of 132-avoiding ones, for all…
Continuous Families of Isophasal Scattering Manifolds
Carolyn Gordon, Peter Perry
We construct continuous families of scattering manifolds with the same scattering phase. The manifolds are compactly supported metric perturbations of Euclidean fo…
Gravitation of the Casimir Effect and the Cosmological Non-Constant
R. R. Caldwell
Whereas the total energy in zero-point fluctuations of the particle physics vacuum gives rise to the cosmological constant problem, differences in the vacuum give rise to real phys…
The Dixmier-Douady Class of Groupoid Crossed Products
Paul S. Muhly, Dana P. Williams
We give a formula for the Dixmier-Douady class of a continuous-trace groupoid crossed product that arises from an action of a locally trivial, proper, principal groupoid on a bundl…
Continuous-Trace Groupoid Crossed Products
Igor Fulman, Paul S. Muhly, Dana P. Williams
Let be a second countable, locally compact groupoid with Haar system, and let be a bundle of -algebras defined over the unit space of on which a…
Central twisted transformation groups and group -algebras of central group extensions
Siegfried Echterhoff, Dana P. Williams
We examine the structure of central twisted transformation group \cs-algebras $C_{0}(X)\rtimes_{\id,u}G$, and apply our results to the group \cs-algebras of central group extension…