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A remark on the paper of A. Tannenbaum. (English) Zbl 0556.14009
This note is an appendix to an article of A. Tannenbaum [ibid. 169- 183 (1984; see the preceding review)] where he analyses locally trivial embedded deformations of plane curves, pointing out an error of B. Segre. In the note this ”error” of Segre is computed in terms of basic invariants of the singularities which implies that the error is zero iff the curve has at most nodes and cusps as singularities.

14H20 Singularities of curves, local rings
14H10 Families, moduli of curves (algebraic)
14C20 Divisors, linear systems, invertible sheaves
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[1] J. Milnor : Singular points of complex hypersurfaces . Princeton: Ann. Math. Studies 61, 1968. · Zbl 0184.48405
[2] J.P. Serre : Groupes algébriques et corps de classes . Paris: Hermann 1959. · Zbl 0097.35604
[3] A. Tannenbaum : On the classical characteristic linear series of plane curves with nodes and cuspidal points: two examples of Beniamino Segre . Comp. Math. 51 (1984) 169-183. · Zbl 0556.14008
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