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Secants, bitangents, and their congruences
Citation key KNT-Secants-Bitangents-And-Their-Congruences
Author Kathlén Kohn and Bernt Ivar Utstøl Nødland and Paolo Tripoli
Title of Book Combinatorial algebraic geometry
Pages 87–112
Year 2017
DOI 10.1007/978-1-4939-7486-3_5
Volume 80
Month 11
Publisher Fields Inst. Res. Math. Sci., Toronto, ON
Series Fields Inst. Commun.
Abstract A congruence is a surface in the Grassmannian $\mathrmGr(1,\mathbbP^3)$ of lines in projective 3-space. To a space curve C, we associate the Chow hypersurface in $\mathrmGr(1,\mathbbP^3)$ consisting of all lines which intersect C. We compute the singular locus of this hypersurface, which contains the congruence of all secants to C. A surface S in $\mathbbP^3$ defines the Hurwitz hypersurface in $\mathrmGr(1,\mathbbP^3)$ of all lines which are tangent to S. We show that its singular locus has two components for general enough S: the congruence of bitangents and the congruence of inflectional tangents. We give new proofs for the bidegrees of the secant, bitangent and inflectional congruences, using geometric techniques such as duality, polar loci and projections. We also study the singularities of these congruences.
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