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Istvan Berkes
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Stand Alone
![On the convergence of [summation symbol]c[subscript k]f(n[subscript k]x)](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fmenrva_img_storage%2Fcovers%2Fopenlibrary%2F13660753.jpg&w=3840&q=80)
![On the Convergence of [Summation Symbol]c[subscript K]f(n[subscript K]x)](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fmenrva_img_storage%2Fcovers%2F9781470405571_4eee5b4a.jpg&w=3840&q=80)