5 citations · 45 across the 42 of their papers we have counts for
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math.CA2002★ 3 cited
Extremal Trigonometrical and Power Polynomials of Several Variables
L. A. Sakhnovich
We consider the set of the power non-negative polynomials of several variables and its subset that consists of polynomials which can be represented as a sum of squares. It is shown…
math.SP2002★ 1 cited
Matrix-Valued Generalizations of the Theorems of Borg and Hochstadt
E. D. Belokolos, F. Gesztesy, K. A. Makarov +1
We prove a generalization of the well-known theorems by Borg and Hochstadt for periodic self-adjoint Schrödinger operators without a spectral gap, respectively, one gap in their sp…