The cogrowth series for BS(N, N) is D-finite

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Journal Article
International Journal of Algebra and Computation, 2014, 24 (2), pp. 171 - 187
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We compute the cogrowth series for Baumslag-Solitar groups BS(N, N) = (a,b aNb = baN), which we show to be D-finite. It follows that their cogrowth rates are algebraic numbers. © 2014 World Scientific Publishing Company.
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