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13 What is a “Ramanujan Graph”? Dec 25 '14
11 Are these three different notions of a graph Laplacian? Nov 28 '14
9 Is there a ``Ladner's Theorem" for the PH-vs-PSPACE scenario? Mar 4 '15
8 What is a branched Riemann surface with cuts? Jul 5 '13
8 Are there exactly solvable CFTs? Oct 13 '13
7 When are (Abelian) Cayley graphs also expanders? Mar 8 '15
7 Constructing Ramanujan graphs from elliptic curves Mar 8 '15
7 What methods do we have to understand the spectrum of matrices with restricted entries? May 21 '15
6 Do perfect matching(s) have signatures in the graph eigenvalues? Dec 5 '14
5 Matching polynomials and Ramanujan graphs Feb 5 '15
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