Linear correlations amongst numbers represented by positive definite binary quadratic forms

@article{Matthiesen2011LinearCA,
  title={Linear correlations amongst numbers represented by positive definite binary quadratic forms},
  author={Lilian Matthiesen},
  journal={arXiv: Number Theory},
  year={2011}
}
Given a positive definite binary quadratic form f, let r(n) = |{(x,y): f(x,y)=n}| denote its representation function. In this paper we study linear correlations of these functions. For example, if r_1, ..., r_k are representation functions, we obtain an asymptotic for sum_{n,d} r_1(n) r_2(n+d) ... r_k(n+ (k-1)d). 
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