Skip to main content
Invariants of curves in RP^2 and R^2
Published Web Location
https://arxiv.org/pdf/math/0602003.pdfNo data is associated with this publication.
Abstract
There is an elegant relation found by Fabricius-Bjerre [Math. Scand 40 (1977) 20--24] among the double tangent lines, crossings, inflections points, and cusps of a singular curve in the plane. We give a new generalization to singular curves in RP^2. We note that the quantities in the formula are naturally dual to each other in RP^2, and we give a new dual formula.