Differential graded module

In algebra, a differential graded module, or dg-module, is a $\mathbb {Z}$-graded module together with a differential; i.e., a square-zero graded endomorphism of the module of degree 1 or -1, depending on the convention. In other words, it is a chain complex having a structure of a module, while a differential graded algebra is a chain complex with a structure of an algebra.

In view of the module-variant of Dold–Kan correspondence, the notion of an $\mathbb {N} _{0}$-graded dg-module is equivalent to that of a simplicial module; "equivalent" in the categorical sense; see #The Dold–Kan correspondence below.

The Dold–Kan correspondence

Given a commutative ring R, by definition, the category of simplicial modules are simplicial objects in the category of modules over R; denoted by sMod_R. Then the category can be identified with the category of differential graded modules.

See also

• Differential graded Lie algebra

References

• http://arxiv.org/abs/math/0602344
• H. Cartan, S. Eilenberg, Homological algebra
• Benoit Fresse, Homotopy of Operads & Grothendieck-Teichmüller Groups