Dupin indicatrices and families of curve congruences

J.W. Bruce, F. Tari

    Research output: Contribution to journalArticle (journal)peer-review

    18 Citations (Scopus)


    We study a number of natural families of binary differential equations (BDE's) on a smooth surface in . One, introduced by G. J. Fletcher in 1996, interpolates between the asymptotic and principal BDE's, another between the characteristic and principal BDE's. The locus of singular points of the members of these families determine curves on the surface. In these two cases they are the tangency points of the discriminant sets (given by a fixed ratio of principle curvatures) with the characteristic (resp. asymptotic) BDE. More generally, we consider a natural class of BDE's on such a surface , and show how the pencil of BDE's joining certain pairs are related to a third BDE of the given class, the so-called polar BDE. This explains, in particular, why the principal, asymptotic and characteristic BDE's are intimately related.
    Original languageEnglish
    Pages (from-to)267-285
    JournalTransactions of the American Mathematical Society
    Issue number1
    Publication statusPublished - 2004


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