Abstract
One obtains asymptotic formulas for the number of solutions of the equation n= f(x,y,z)+w2k, where f is a primitive integral quadratic form. One gives an estimate of the remainder, having a logarithmic reducing factor in the general case and a powerlike one when f(x,y,z)=x2+y2+z2.
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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 144, pp. 27–37, 1985.
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Golubeva, E.P. Waring's problem for a ternary quadratic form and an arbitrary even power. J Math Sci 38, 2045–2054 (1987). https://doi.org/10.1007/BF01474437
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DOI: https://doi.org/10.1007/BF01474437