Annali di Matematica Pura ed Applicata

, Volume 103, Issue 1, pp 11–28 | Cite as

Normal elliptic scrollar varieties

  • J. G. Semple
  • J. A. Tyrrell


In his classical memoir on the projective classification of elliptic ruled surfaces Corrado Segre described in particular two most general normal types, of even and odd order respectively, of which the former has precisely two minimum directrix curves, while the latter has an elliptic pencil of such curves. The present paper extends this work to normal elliptic scrollar varieties of dimension k, defining and describing k most general types of such varieties. Particular attention is paid to one of these types, which we call the simploid, in which the points of the variety correspond to the unordered sets of k values of an elliptic parameter (modulo its periods). The paper concludes with the identification of a series of self-dual « linked pairs » of such scrollar varieties, of which the simplest example is that of the elliptic quintic ruled surface and the elliptic quintic scrollar threefold in four-dimensional space.


General Type Normal Type Projective Classification Elliptic Parameter Elliptic Pencil 
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© Fondazione Annali di Matematica Pura ed Applicata 1974

Authors and Affiliations

  • J. G. Semple
  • J. A. Tyrrell

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