Has anyone seen a definition for a pseudo parallelogram ? I have seen that terminology used in an old paper in the Transactions of the AMS, but I am not clear on what the definition is. Some of my current research involves quadrilaterals which are generalizations of parallelograms in a certain sense. I have thought of calling them pseudo parallelograms(or perhaps quasi-parallelograms), but I do not want to use terminology which may have already been established.
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$\begingroup$ Does that Transactions paper not define the term, or reference some other paper where it is defined? $\endgroup$– Robert IsraelCommented Sep 14, 2016 at 20:18
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$\begingroup$ @RobertIsrael I assume this is the paper: books.google.com/… $\endgroup$– Igor RivinCommented Sep 15, 2016 at 0:41
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$\begingroup$ I haven't actually looked at the paper yet except for the part you provided the link to. I was really wondering where else it might have been used and/or defined ? $\endgroup$– Alan HorwitzCommented Sep 15, 2016 at 2:48
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$\begingroup$ Apparently the definition is given in a paper by J. Mercer from 1908, but I haven't been able to locate that paper yet. I will probably just use the terminology since it does not appear much at all in a Google search. $\endgroup$– Alan HorwitzCommented Sep 15, 2016 at 15:52
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