Indecomposable branched coverings over the projective plane by surfaces M with X(M) ≤ 0статья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:In this work we study the decomposability property of branched coverings of odd degree d, over the projective plane, where the covering surface has Euler characteristic <= 0. The latter condition is equivalent to say that the defect of the covering is greater than d. We show that, given a datum D = {D_1,...,D_s} with an even defect greater than d, it is realizable by an indecomposable branched covering over the projective plane. The case when d is even is known.