93 citations · 748 across the 47 of their papers we have counts for
51 papers
The Beauty of Roots
John C. Baez
A "Littlewood polynomial" is a polynomial whose coefficients are all 1 or -1. The set of all complex roots of all Littlewood polynomials exhibits many complicated, beautiful and fa…
Isotropy fibers of ideals in groupoid C-algebras
Johannes Christensen, Sergey Neshveyev
Given a locally compact étale groupoid and an ideal in its groupoid C-algebra, we show that defines a family of ideals in group C-algebras of the isotropy groups an…
Ext groups in Homotopy Type Theory
J. Daniel Christensen, Jarl G. Taxerås Flaten
Ext groups are fundamental homological invariants which have important applications in homotopy theory and algebra. In particular, they appear in the classical universal coefficien…
Central H-spaces and banded types
Ulrik Buchholtz, J. Daniel Christensen, Jarl G. Taxerås Flaten +1
We introduce and study central types, which are generalizations of Eilenberg-Mac Lane spaces. A type is central when it is equivalent to the component of the identity among its own…
Tracial weights on topological graph algebras
Johannes Christensen
We describe two kinds of regular invariant measures on the boundary path space of a second countable topological graph, which allows us to describe all extremal tracial weights on…
Non-accessible localizations
J. Daniel Christensen
In a 2005 paper, Casacuberta, Scevenels and Smith construct a homotopy idempotent functor on the category of simplicial sets with the property that whether it can be expressed…