Berndt, Bruce C.; Dixit, Atul; Kim, Sun; Zaharescu, Alexandru
(Elsevier, 2018-11)
Letrk(n) denote the number of representations of the positive integernas thesum ofksquares. We rigorously prove for the first time a Vorono ?? summation formula forrk(n), k?2,proved incorrectly by A. I. Popov and later ...