For a Zariski general (regular) hypersurface $V$ of degree $M$ in the$(M+1)$-dimensional projective space, where $M$ is at least 16, with at mostquadratic singularities of rank at least 13, we give a complete description ofthe structures of rationally connected (or Fano-Mori) fibre space: every suchstructure over a positive-dimensional base is a pencil of hyperplane sections.This implies, in particular, that $V$ is non-rational and its groups ofbirational and biregular automorphisms coincide. The set of non-regularhypersurfaces has codimension at least $rac12(M-11)(M-10)-10$ in the naturalparameter space.
展开▼
机译:对于Zariski General(常规)高度为$ m $ v $ m $ m $ m $ - 维度投影空间,其中$ m $至少16次,在班级的额定奇异度至少13,我们提供合理连接(或FANO-MORI)光纤空间结构的完整描述:正尺寸基础上的每个结构都是超平面部分的铅笔。这意味着,特别是$ V $是非理性及其组二核苷酸和双边同一性一致。该组非正常脉冲覆盖物具有至少$ FRAC12(M-11)(M-10)-10 $的CODIMINUSINUSING。
展开▼