  We show that new definitions of the notion of "projection" on which some of
the recent "extended formulations" works (such as Kaibel (2011); Fiorini et al.
(2011; 2012); Kaibel and Walter (2013); Kaibel and Weltge (2013) for example)
have been based can cause those works to over-reach in their conclusions in
relating polytopes to one another when the sets of the descriptive variables
for those polytopes are disjoint.
