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Commutative rings, modules, ideals, homological algebra, computational aspects, invariant theory, connections to algebraic geometry and combinatorics.
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a net of quadrics and the corresponding intersection
Let $Q_i(i=1,2,3)$ be quadric hypersurface in $\mathbb{P}^4$. Consider a net of quadrics
$\Lambda=(Q_1,Q_2,Q_3)$.
I can't understand some part of proof of Corollary 2.8(p.11) in Stability of genus 5 …