Let f(x) denote a complex valued function with period 2Ï€, let $P_r(f, x) = \frac{1}{2\pi}\int^\pi_{-\pi}\frac{1 - r^2)f(y)dy}{1 - 2r \cos(x - y) + r^2}$ be the ...
The study of Schrödinger operators within the framework of functional analysis has led to significant advances in our understanding of differential operators and their associated function spaces. In ...
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