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The primary source code repository for Macaulay2, a system for computing in commutative algebra, algebraic geometry and related fields.

The primary source code repository for Macaulay2, a system for computing in commutative algebra, algebraic geometry and related fields.

A)=E_{*}(X/A,*)={\tilde {E}}_{*}(X/A)} ，对映射锥使用切除定理可得到。 映射锥 (同调代数)（英语：Mapping cone (homological algebra)） Peter ...

If any of these statements holds, the sequence is called a split exact sequence, and the sequence is said to split. In the form stated here, the splitting lemma does not hold in the full category of ...

Morey, Susan Noh, Sunsook and Vasconcelos, Wolmer V. 1995. Symbolic powers, Serre conditions and Cohen-Macaulay Rees algebras. Manuscripta Mathematica, Vol. 86, Issue ...

exactness and excision you master the basic homological algebra associated to chain complexes and their homology, and can use simplicial and cellular homology to make effective calculations of ...