Norms of free operators

Picardello, Massimo A.; Pytlik, Tadeusz

doi:10.1090/S0002-9939-1988-0958078-7

Norms of free operators
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by Massimo A. Picardello and Tadeusz Pytlik PDF

Proc. Amer. Math. Soc. 104 (1988), 257-261 Request permission

Abstract:

We give a short and elementary proof of the formula for the norm of a free convolution operator on ${L^2}$ of a discrete group. The formula was obtained in 1976 by C. Akemann and Ph. Ostrand, and by several other authors afterwards.

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