Uriya First

Ramanujan graphs are k-regular graphs admitting optimal connectivity properties (namely, optimal expanders). Infinite families of such graphs were first constructed by Lubotzky, Phillips and Sarnak in 1988 by relating the spectrum of a graph with...

Let K be a field, let t : K à K be an automorphism of order 1 or 2. Let F denote the subfield of t-invariant elements in K. Then either K=F or K/F is a quadratic Galois extension. Given a central simple K-algebra A, a t-involution of A is an anti...