First example of virtually nilpotent group with non-D-finite Green series, via arithmetical miracle and subword complexity of a multiplicative sequence.
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3 Pith papers cite this work. Polarity classification is still indexing.
3
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Proves that the Q-dimension of the span of zeta(k,a/q) - (-1)^k zeta(k,1-a/q) is at least (c-o(1)) log q as q to infinity, for fixed k >= 2.