Tag Archives: emily riehl

Courses in Cambridge (MA), Spring 2012

There are a couple interesting courses happening this Spring (2012) in the Boston area.

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The homotopy category doesn’t have all colimits. I just learned a nice explicit example of this phenomenon in Emily Riehl’s class on categorical homotopy theory at Harvard. The example (7.21 in the notes), attributed to Michael Andrews and Markus Hausmann, is for … Continue reading