Ideal Sheaf

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We describe the Ideal Sheaf
  1. Harpreet Bedi
  2. Ideal Sheaf
  3. Algebraic Geometry
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Автор

You define O_Y(U) = O_X(Y \cap U) for Y a closed subset. But aren't the sections of sheaf O_X defined only on open sets? It is not clear to me that Y \cap U is open in X for Y a closed subset.

tomuf