On Popoviciu type tormulas for generalized restricted partition function

Details On Popoviciu type tormulas for generalized restricted partition function On Popoviciu type tormulas for generalized restricted partition function

2007-09-22

arxiv.org/abs/0709.3571v1

Mathematics

Number Theory

13 pages

Scientific paper

Suppose that $a_1(n),a_2(n),...,a_s(n),m(n)$ are integer-valued polynomials in $n$ with positive leading coefficients. This paper presents Popoviciu type formulas for the generalized restricted partition function $$p_{A(n)}(m(n)):=#\{(x_1,...,x_s)\in \mathbb{Z}^{s}: all x_j\geqslant 0, x_1a_1(n)+...+x_sa_s(n)=m(n) \}$$ when $s=2$ or 3. In either case, the formula implies that the function is an integer-valued quasi-polynomial. The main result is proved by a reciprocity law for a class of fractional part sums and the theory of generalized Euclidean division.

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