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Aug 25, 2015 at 17:17 comment added darij grinberg I still don't get it.
Aug 25, 2015 at 16:54 comment added Moh514 I mean you can uniquely construct $x_{\sigma(1)}^{\alpha_1} x_{\sigma(2)}^{\alpha_2}\cdots x_{\sigma(k)}^{\alpha_k}$, in $ P_{k,\ell} = \prod_{1\leq a_1+\ldots+a_k\leq \ell} (a_1x_1+\ldots + a_kx_k)$
Aug 25, 2015 at 15:02 comment added darij grinberg Not sure I get your argument.
Aug 25, 2015 at 2:25 history answered Moh514 CC BY-SA 3.0