After a busy day giving final exams in the MASS program it was nice to learn today that my paper with Paul Siegel about sheaves of C*-algebras has appeared in the *Journal of K-Theory*. The link for the published version is

http://journals.cambridge.org/repo_A91rlWyM

This paper arose from some discussions when Paul was writing his thesis. We were talking about the “lifting and controlling” arguments for Paschke duals that are used in the construction of various forms of operator-algebraic assembly maps (an early example is the one that appears in my paper with Nigel on the coarse Baum-Connes conjecture, which asserts that the quotient \( D^*(X)/C^*(X) \) of the “controlled” pseudolocal by the “controlled” locally compact operators does not depend on the assumed “control”). At some point in these discussions I casually remarked that, “of course”, what is really going on is that the Paschke dual is a sheaf. Some time later I realized that what I had said was, in fact, true. There aren’t any new results here but I hope that there is some conceptual clarification. (There is an interesting spectral sequence that I’ll try to write about another time, though.)