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Is it possible ?

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Rather obviously yes.

Let $A$ be the algebra over the field $K$ generated by elements $a_1,a_2,\ldots,$ with $a_i$ in dimension $i$ and with $a_ia_j=0$ for all $i$ and $j$. This is an incredibly uninteresting example, but since each graded piece is one-dimensional, its Poincare series is $\sum_{n=0}^\infty t^n=1/(1-t)$.

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  • $\begingroup$ I agree but I am interested with an algebra with non-trivial multiplication. $\endgroup$ – Melania Sep 29 '10 at 20:47
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    $\begingroup$ @Melania: how about start as Robin did, and then kill all $a_ia_ja_k$? $\endgroup$ – Hailong Dao Sep 29 '10 at 21:23
  • $\begingroup$ Yes..The Poincare series will be $\dfrac{1}{(1-t)(1-t^2)}.$ Thanks! $\endgroup$ – Melania Sep 29 '10 at 21:54

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