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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.math
Subject: Re: Euler's(?) formula
Message-ID: <11314@brl-tgr.ARPA>
Date: Thu, 20-Jun-85 23:53:51 EDT
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Posted: Thu Jun 20 23:53:51 1985
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> ...  What it does not apply to is non-simple
> polyhedra, that is, those with "tunnels" in them.

They better be connected, too.