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Tag Archives: Alan Hoffman
Hoffman, Lovász and Haemers
At the weekend I attended remotely a memorial session for Alan Hoffman, organised by Bill Pulleyblank. I found it informative, as well as moving. Hoffman is wellknown in the algebraic graph theory community for a number of remarkable achievements, including … Continue reading
Posted in events
Tagged Alan Hoffman, algebraic graph theory, eigenvalues, Laszlo Lovasz, optimization, WIllem Haemers
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Alan Hoffman
I have just heard the news that Alan Hoffman has died, at the age of 96. There is much to say about Alan; I will restrict myself to my own person perspective, and not even all of that; I didn’t … Continue reading
Peter Sarnak’s Hardy Lecture
Yesterday, Peter Sarnak gave the London Mathematical Society’s 2020 Hardy Lecture (remotely). He talked about gaps in the spectra of connected cubic graphs. It was a talk properly described as a tour de force, applying to the problem ideas from … Continue reading
Posted in events, exposition
Tagged Alan Hoffman, fullerenes, generalised line graphs, Ramanujan graphs, spectral gaphs, waveguides
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G2D2, 4: the second week
The lecturers of the first two minicourses now gave way for the second team. Mike Boyle and Scott Schmieding told us about symbolic dynamics, in particular, subshifts and their automorphism groups. This was particularly valuable to me: I had dove … Continue reading