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The present paper is devoted to the study of flags in Euclidean threespace. Coordinates of flags are defined and a point model in a projective space is discussed. We study special subsets of the(More)
We study the set of circles which intersect a Dupin cyclide in at least two different points orthogonally. Dupin cyclides can be obtained by inverting a cylinder, or cone of revolution, or by(More)
The present paper deals with the computation of the common normals of two tori. We use line geometry in order to describe these common normals as the solution of a system of algebraic equations.(More)