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math.FA2018
Weighted Join Operators on Directed Trees
Sameer Chavan, Rajeev Gupta, Kalyan B. Sinha
A rooted directed tree with can be extended to a directed graph by adding a vertex to and declaring each v…
math.FA2018
Von Neumann's inequality for commuting operator-valued multishifts
Rajeev Gupta, Surjit Kumar, Shailesh Trivedi
Recently, Hartz proved that every commuting contractive classical multishift with non-zero weights satisfies the matrix-version of von Neumann's inequality. We show that this resul…