Tag Archives: Peter Pal Palfy

Asymptotic group theory, 3

A Ramanujan graph is a connected finite graph of valency k whose eigenvalues (apart from k and −k) all have modulus at most 2√(k−1). This interval is the spectrum of the infinite k-valent tree T (regarded as an operator on … Continue reading

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In Budapest

I am back in Budapest, my fifth visit to this lovely city, but the first for thirteen years. We are celebrating the 60th birthday of Péter Pál Pálfy, or P3, with a conference on Asymptotic Group Theory, of which more … Continue reading

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