– This week is spring break at SFSU, so there are no lectures this week.

– Jeremy Martin visited SFSU last week and gave a great lecture on the incidence Hopf algebra of graphs. In particular he gave a solution to a (hard, I agree) problem on homework 3. Seth kindly recorded his lecture – it is at http://math.sfsu.edu/federico/Clase/Hopf/LectureVideos/jeremymartin.mp4

– I posted solutions to homework 2. Apologies for the delay – the SFSU math server was having some problems.

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