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Acquistapace, Francesca ; Broglia, Fabrizio ; Fernando Galván, José Francisco | SCUOLA NORMALE SUPERIORE DI PISA | 2014In this work, we present "infinite" multiplicative formulae for countable collections of sums of squares (of meromorphic functions on R-n). Our formulae generalize the classical Pfister's ones concerning the representation as a sum of 2(r) squar[...]
