Talk:Incidence algebra
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I take it the zeta function is always invertible? (I figured that one out.) Is there a characterization of the invertible elements in the algebra? AxelBoldt 23:36 Jan 8, 2003 (UTC)
Mike, non-logged in users cannot mark edits as "minor" anymore, because some have used that to hide vandalism. Maybe it would be good if you logged in anyway, because then people could leave you messages on your user page. AxelBoldt 04:36 Jan 9, 2003 (UTC)
What is exactly the connection with classical Euler characteristic ? Is the classical Euler ch. equal to the incidence Euler ch. of the poset of faces of the polyhedron ? It would be nice to put that information both in this article and in Euler characteristic. --FvdP 18:47 Jan 9, 2003 (UTC)
Good question. I find I can't answer it as quickly and efficiently as I would have hoped; stay tuned ..... -- Mike Hardy
