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Complexity of intersections of real quadrics and topology of symmetric determinantal varieties

机译:实二次曲面的交集和对称行列式变体的拓扑复杂性

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Let W be a linear system of quadrics on the real projective space RPn and X be the base locus of that system (i.e. the common zero set of the quadrics in W). We prove a formula relating the topology of X to that of the discriminant locus Sigma(W) (i.e. the set of singular quadrics in W). The set Sigma(W) equals the intersection of W with the discriminant hypersurface for quadrics; its singularities are unavoidable (they might persist after a small perturbation of W) and we let {Sigma((r))(W)}(r >= 1) be its singular point filtration, i.e. Sigma((1))(W) = Sigma(W) and Sigma((r))(W) = Sing(Sigma((r-1))(W)) With this notation, for a generic W the above mentioned formula reads
机译:设W为实投影空间RPn上的二次曲面的线性系统,而X为该系统的基本轨迹(即W中二次曲面的公共零集)。我们证明了一个将X的拓扑与判别轨迹Sigma(W)的拓扑相关的公式(即W中的奇异二次曲面的集合)。集合Sigma(W)等于W与二次曲面的判别超曲面的交点;它的奇异性是不可避免的(在W的微小扰动下它们可能会持续存在),我们将{Sigma((r))(W)}(r> = 1)设为其奇异点过滤,即Sigma((1))(W )= Sigma(W)和Sigma((r))(W)= Sing(Sigma((r-1))(W))对于这种通用W,上述公式为

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