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Rational quadrilaterals and tetrahedra -- the involutions of Kummer, Heegner and Regge
This paper is devoted to questions concerning rational quadrilaterals and rational tetrahedra. In both cases there is a finite group which acts on the set. In the case of rational quadrilaterals it was discovered by Kurt Heegner; in the second case there are two variants, one again due to Heegner th
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