93 citations · 748 across the 47 of their papers we have counts for
5 papers · 1 filter
Symmetries of the KMS simplex
Johannes Christensen
A continuous groupoid homomorphism on a locally compact second countable Hausdorff étale groupoid gives rise to a -dynamical system in which every -KMS…
Smooth classifying spaces
J. Daniel Christensen, Enxin Wu
We develop the theory of smooth principal bundles for a smooth group , using the framework of diffeological spaces. After giving new examples showing why arbitrary principal bun…
Equilibrium and ground states from Cayley graphs
Johannes Christensen, Klaus Thomsen
We study the KMS states and states of generalized gauge actions on the -algebra of a pointed Cayley graph. Our results provide information for any finitely gene…
Diffeological vector spaces
J. Daniel Christensen, Enxin Wu
We study the relationship between many natural conditions that one can put on a diffeological vector space: being fine or projective, having enough smooth (or smooth linear) functi…
Counterexamples to conjectures about Subset Takeaway and counting linear extensions of a Boolean lattice
Andries E. Brouwer, J. Daniel Christensen
We develop an algorithm for efficiently computing recursively defined functions on posets. We illustrate this algorithm by disproving conjectures about the game Subset Takeaway (Ch…