Abstract
It is a classical and interesting problem, which is still in the centre of theoretical research, to study the variety V of (reduced, irreducible) curves C ⊂ ℙ 2 = ℙ 2(ℂ) of degree d having exactly r singularities of prescribed (topological or analytic) types S 1,…, S r . Among the most important questions are:
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Is V ≠ θ (existence problem)?
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Is V irreducible (irreducibility problem)?
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Is V smooth and of expected dimension (T-smoothness problem)?
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Greuel, GM., Lossen, C. (2001). The Geometry of Families of Singular Curves. In: Siersma, D., Wall, C.T.C., Zakalyukin, V. (eds) New Developments in Singularity Theory. NATO Science Series, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0834-1_7
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