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تسجيل مستخدم جديدThe cogrowth series for $mathrm{BS}(N,N)$ is D-finite
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We compute the cogrowth series for Baumslag-Solitar groups $mathrm{BS}(N,N) = < a,b | a^N b = b a^N > $, which we show to be D-finite. It follows that their cogrowth rates are algebraic numbers.
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