Reducible Families of Curves with Ordinary Multiple Points on Surfaces in Projective Three-Space

Details Reducible Families of Curves with Ordinary Multiple Points on Surfaces in Projective Three-Space Reducible Families of Curves with Ordinary Multiple Points on Surfaces in Projective Three-Space

2007-06-16

arxiv.org/abs/0706.2440v1

Comm. in Algebra 34,5 (2006), 1921-1926

Mathematics

Algebraic Geometry

5 pages

Scientific paper

In math.AG/0108089, math.AG/0212090 and math.AG/0308247 we gave numerical conditions which ensure that an equisingular family is irreducible respectively T-smooth. Combining results by Greuel, Lossen and Shustin and an idea from math.AG/9802009 we give in the present paper series of examples of families of irreducible curves on surfaces in projective three-space with only ordinary multiple points which are reducible and where at least one component does not have the expected dimension. The examples show that for families of curves with ordinary multiple points the conditions for T-smoothness in math.AG/0308247 have the right asymptotics.

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