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We know the busiest international crossing is the USA/Mexico border, but what are the most frequently crossed borders, within the USA? My guesses are below. Suggestions and criticism welcome! New York / New Jersey: Pretty obvious first. This border intersects the largest metro area in the USA, up to a million commuters cross daily betweenRead more

Does there exist a method to compute the K-theory $ $ K(A \rtimes G)$ $ for a discrete, countable groupoid $ G$ and $ G$ -$ C^*$ -algebra $ A$ ? In good cases, say $ G$ is ameanable. Say, via Baum–Connes and a Chern-character? But which Chern character? (This question has partial overlapp withRead more