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On Briançon–Skoda Theorem for Foliations
(Elsevier GmbH, 2023-12-01)
We generalize Mattei's result relative to the Briançon–Skoda theorem for foliations to the family of foliations of the second type. We use this generalization to establish relationships between the Milnor and Tjurina numbers of foliations of second type, inspired by the results obtained by Liu for complex hypersurfaces and we determine a lower bound for the global Tjurina number of an algebraic curve.
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An upper bound for the GSV-index of a foliation
(Springer Science+Business Media, 2025-04-01)
Let F be a holomorphic foliation at p∈C2, and let B be a separatrix of F. We prove the following upper bound GSVp(F,B)≤4τp(F,B)-3μp(F,B), where GSVp(F,B) is the Gómez-Mont-Seade-Verjovsky index of the foliation F with respect to B, μp(F,B) is the multiplicity of F along B and τp(F,B) is the dimension of the quotient of C{x,y} by the ideal generated by the components of any 1-form defining F and any equation of B.
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