General Properties
- If f: A → B is a homomorphism between two sheaves of rings on the same space X, the kernel of f is an ideal sheaf in A.
- Conversely, for any ideal sheaf J in a sheaf of rings A, there is a natural structure of a sheaf of rings on the quotient sheaf A/J. Note that the canonical map
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- Γ(U, A)/Γ(U, J) → Γ(U, A/J)
- for open subsets U is injective, but not surjective in general. (See sheaf cohomology.)
Read more about this topic: Ideal Sheaf
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