Research Institute for Symbolic Computation, Johannes Kepler University, A-4040 Linz, Austria; e-mail: Josef.Schicho@risc.uni-linz.ac.at http://www.risc.uni-linz.ac.at/people/jschicho
Abstract: We give a classification of the surfaces that can be generated by a moving conic in more than one way. It turns out that these surfaces belong to classes which have been thoroughly studied in other contexts (ruled surfaces, Veronese surfaces, del Pezzo surfaces).
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