Abstract

We shall introduce and study quadratic entry locus varieties, a class of projective algebraic varieties whose extrinsic and intrinsic geometry is very rich. Let us recall that, for an irreducible non-degenerate variety X ⊂ P N of dimension n ≥ 1, the secant defect of X, denoted by δ(X), is the difference between the expected dimension and the effective dimension of the

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