Tag Archives: emily riehl

Courses in Cambridge (MA), Spring 2012

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


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