188 citations · 327 across the 48 of their papers we have counts for
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math.FA2016★ 13 cited
On Helson matrices: moment problems, non-negativity, boundedness, and finite rank
Karl-Mikael Perfekt, Alexander Pushnitski
We study Helson matrices (also known as multiplicative Hankel matrices), i.e. infinite matrices of the form , where is a sequence of complex nu…
math.SP2016
Spectral asymptotics for compact self-adjoint Hankel operators
Alexander Pushnitski, Dmitri Yafaev
We describe large classes of compact self-adjoint Hankel operators whose eigenvalues have power asymptotics and obtain explicit expressions for the coefficient in front of the lead…
math.CA2016
Best rational approximation of functions with logarithmic singularities
Alexander Pushnitski, Dmitri Yafaev
We consider functions on the unit circle with a finite number of logarithmic singularities. We study the approximation of by rational functions and find an asym…