14 citations · 34 across the 19 of their papers we have counts for
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math.FA2022★ 1 cited
Essential positivity
A. Perälä, J. A. Virtanen
We define essentially positive operators on Hilbert space as a class of self-adjoint operators whose essential spectra is contained in the nonnegative real numbers and describe the…
math.FA2022★ 3 cited
On the product formula for Toeplitz and related operators
Jani A. Virtanen
In this note known formulas for the product of Toeplitz operators are revisited in the context of their applications to the study of Fredholmness, boundedness of Toeplitz products,…