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The Fermat curves, arrangements of lines, and intersections of osculating curves
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In this paper we present new results about arrangements of lines and osculating curves associated to the Fermat curves in the projective plane. We first consider the sextactic points on the Fermat curves and show that they are distributed on three grids. The grid lines constitute new line arrangements and examples of free curves associated with the Fermat curves. Moreover, we compute the hyperosculating conics to the Fermat curves, study the arrangement of these conics, and find that they intersect in a special way. The latter result is a consequence of the action of the group of automorphisms on osculating curves, and we conclude with a more general result for intersections of osculating curves of any given degree.
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The Hesse pencil of plane curves and osculating conics
Explicit osculating conics for Hesse pencil cubics are obtained, and their products with the cubic yield new free and nearly free curves beyond the Fermat case.
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