View source for Talk:Polyhedron, abstract

This page is critized as erronneous.

In an email to [[User:Ulf Rehmann | Ulf Rehmann]], dated Apr 21, 2012, Branko Günbaum says:

... I am sorry to have to report that this is totally  
unacceptable. There is nothing "abstract" about the material described  
in the text, but there are quite horrendous errors.  One of them is  
the assertion that "... any open subset of a Euclidean space is a  
polyhedron" -- this coming right after we are told that a polyhedron  
is the finite union of closed (actually compact) convex sets. Clearly,  
the writer had some other concepts in mind -- but it is hard to make  
local changes in a connected set of entries.