Elsevier

Journal of Algebra

Volume 128, Issue 2, 1 February 1990, Pages 356-365
Journal of Algebra

On the length of the absolute samuel stratum

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Abstract

Let X be a scheme of finite type over the field of complex numbers and let x be the generic point of the center of a permissible monoidal transformation X′ → X. If the generic point y of the projectivization of the strict tangent space TxX is an infinitely near H-fold point to X at x (i.e., the Hilbert-Samuel function of X′ at y “coincides” with the Hilbert-Samuel function of X at x) then the length of the Samuel stratum of X passing through x strictly decreases whenever it is finite.

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