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Asymptotic results for the number of Wagner's solutions to a generalised birthday problem
Alexey Lindo, Serik Sagitov · 2015-07-20 · via math.PR updates on arXiv.org

We study two functionals of a random matrix $\boldsymbol A$ with independent elements uniformly distributed over the cyclic group of integers $\{0,1,\ldots, M-1\}$ modulo $M$. One of them, $V_0(\boldsymbol A)$ with mean $μ$, gives the total number of solutions for a generalised birthday problem, and the other, $W(\boldsymbol A)$ with mean $λ$, gives the number of solutions detected by Wagner's tree based algorithm. We establish two limit theorems. Theorem 2.1 describes an asymptotical behaviour of the ratio $λ/μ$ as $M\to\infty$. Theorem 2.2 suggests Chen-Stein bounds for the total variation distance between Poisson distribution and distributions of $V_{0}$ and $W$.

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