Abstract
We characterize conic sections in the Euclidean plane in terms of appropriate eigenfunctions of second order on their spherical image; we clarify the affine background of such results.
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Dedicated to S.S. Chern
Research partially supported by DFG Si-163/7-2
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Schwenk-Schellschmidt, A., Simon, U. & Wiehe, M. Eigenvalue equations in curve theory. Results. Math. 40, 273–285 (2001). https://doi.org/10.1007/BF03322712
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DOI: https://doi.org/10.1007/BF03322712