Abstract
We are ready to accomplish our main task, that is to answer the two following questions concerning equisingular families (ESF) of curves. whether a family of algebraic curves with a prescribed collection of singularities form a nonempty, T-smooth (i.e. smooth of expected dimension), irreducible stratum in the discriminant in a given linear system |D| on a smooth algebraic surface \({\varSigma }\), and what is the local structure of the discriminant in a neighborhood of the above stratum, in particular, when is a family deformation complete (i.e. when are any simultaneous local deformations of the curve singularities induced by the given linear system).
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Notes
- 1.
We use the little-o notation, meaning that the correction term o(f(d)) includes only lower powers in d than f(d).
- 2.
- 3.
With the capital O-notation, meaning that the correction term O(d) is linear in d.
- 4.
This phenomenon has first been observed by Wahl in 1974 [Wah1], where he presented the first series of irreducible plane curves C (with only nodes and cusps) such that the corresponding ESF is non-smooth, but has a smooth reduction: \(V_{104}^{{ irr}} (3636 \!\!\, \cdot \!\!\, A_1, \,900 \!\cdot \!\!\,A_2)\).
- 5.
A zero-dimensional scheme \(Z\subset {\mathbb P}^n\) is called curvilinear if, for each p in the support of Z, there is a smooth curve germ \((C,p)\subset ({\mathbb P}^n,p)\) and some integer \(\ell \ge 1\) such that \({\mathcal O}_{Z,p}={\mathcal O}_{C,p}/\mathfrak {m}_p^\ell \).
- 6.
Such a curve can easily be constructed by applying the Cremona transformation to the 3-cuspidal quartic curve so that one of the axes is quadratically tangent to the quartic, and the fundamental points of the coordinate system are non-singular points of the quartic (we leave details to the reader).
- 7.
For example, \({\sigma }_1=({\varDelta }_1)_-\).
- 8.
Here \({\mathcal S}_{f_k}\) denotes the collection of contact analytic types of singular points of \(f_k\) in \(({\mathbb C}^*)^n\) in the sense of Sect. 2.3.2.
- 9.
Here “generic” means that the object considered can be chosen arbitrarily in a Zariski open subset of the whole space of objects.
- 10.
Note that, over the reals, the deformation problem is much more delicate than over the complex field.
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Greuel, GM., Lossen, C., Shustin, E. (2018). Equisingular Families of Curves. In: Singular Algebraic Curves. Springer Monographs in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-030-03350-7_4
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