Furuta, Yoshiomi Gaussian composition of congruence classes. (English) Zbl 0772.11011 Sci. Rep. Kanazawa Univ. 37, No. 1, 1-22 (1992). The author generalizes some results concerning Gaussian composition of binary quadratic forms to the case of congruence classes and explicitly describing the form representing a duplication modulo \(m\) of a given binary quadratic form. Reviewer: K.Kozioł (Katowice) MSC: 11E16 General binary quadratic forms Keywords:Gaussian composition of binary quadratic forms; congruence classes; duplication; ternary form representation PDFBibTeX XMLCite \textit{Y. Furuta}, Sci. Rep. Kanazawa Univ. 37, No. 1, 1--22 (1992; Zbl 0772.11011)