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@DavidESpeyer If the bijection $f$ is defined as these, how can I define the "multiplication of two periodic sequences", or the expression between $f_k(xy)$ and the entries of $f(x)$ and $f(y)$?
@EmilJeřábek If the bijection $f$ is defined as these, how can I define the "multiplication of two periodic sequences", or the expression between $f_k(xy)$ and the entries of $f(x)$ and $f(y)$?
