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math.MG2010★ 1 cited
Measuring quadric sectors at centre
Helmut Kahl
Sectors at centre of affine quadrics with point symmetry are investigated over arbitrary fields of characteristic different from two. As an application we demonstrate nice formulas…
math.GM2010
An euclidean affine invariant of quadrilaterals
Helmut Kahl
A certain real number, depending on two neighbouring sides of a quadrilateral and the diagonal meeting these two sides at their common point, is shown to be invariant under affinit…