Abstract
Let k be an algebraically closed group field of characteristic zero. The following result is well known (see Severi [3], Anhang F):
If σn d is a maximal irreducible algebraic system, defined over k, of plane algebraic (not necessarily irreducible) curves of a given order n, and if the general curve C* of σn d/k has d nodes (and no other singularities), then the dimension of σn d EquationSource% MathType!MTEF!2!1!+- % feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiCaiabg2 % da9maalaaabaGaaiikaiaad6gacqGHsislcaaIXaGaaiykamaabmaa % baGaamOBaiabgkHiTiaaikdaaiaawIcacaGLPaaaaeaacaaIYaaaaa % aa!40D4!]]</EquationSource><EquationSource Format="TEX"><![CDATA[$$p = \frac{{(n - 1)\left( {n - 2} \right)}}{2}$$ is equal to 3n + p − 1, where is the “effective” genus of C*.
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References
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Zariski, O. (1983). On the Problem of Irreducibility of the Algebraic System of Irreducible Plane Curves of a Given Order and Having a Given Number of Nodes. In: Artin, M., Tate, J. (eds) Arithmetic and Geometry. Progress in Mathematics, vol 36. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4757-9286-7_19
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DOI: https://doi.org/10.1007/978-1-4757-9286-7_19
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