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arXiv · 2609.40101

Rational quadrilaterals and tetrahedra -- the involutions of Kummer, Heegner and Regge

S. J. Patterson
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Abstract

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 the other a consequence of an involution introduced by Tullio Regge. These allow one to construct a number of solutions to the appropriate diophantine equation from given ones. The original question was posed by Kummer. There is an intimate connection with the theory of the tetrahedroid and so Kummer surfaces.

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S. J. Patterson. 2026-09-30. Rational quadrilaterals and tetrahedra -- the involutions of Kummer, Heegner and Regge. https://arxiv.org/abs/2609.40101

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