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Parabolic Raynaud bundles
Authors:Indranil Biswas  Georg Hein
Institution:1.School of Mathematics,Tata Institute of Fundamental Research,Bombay,India;2.Fachbereich Mathematik,Universit?t Duisburg-Essen,Essen,Germany
Abstract:Let X be an irreducible smooth projective curve defined over the field of complex numbers, $$S=\{p_1, p_2,\ldots,p_n\} \subset X$$ a finite set of closed points and N ≥ 2 a fixed integer. For any pair $$(r,d)\in {\mathbb N} \times \frac{1}{N} {\mathbb Z}$$, there exists a parabolic vector bundle $$R_{r,d,*}$$ on X, with parabolic structure over S and all parabolic weights in $$\frac{1}{N} \mathbb Z$$, that has the following property: Take any parabolic vector bundle $$E_*$$ of rank r on X whose parabolic points are contained in S, all the parabolic weights are in $$\frac{1}{N}\mathbb Z$$ and the parabolic degree is d. Then $$E_*$$ is parabolically semistable if and only if there is no nonzero parabolic homomorphism from $$R_{r,d,*}$$ to $$E_*$$.
Keywords:Mathematics Subject Classification (2000)" target="_blank">Mathematics Subject Classification (2000)  14F05  14H60
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