title: Simplicial group
text: # Simplicial group
  
  In mathematics, more precisely, in the theory of simplicial sets, a simplicial group is a simplicial object in the category of groups. Similarly, a simplicial abelian group is a simplicial object in the category of abelian groups. A simplicial group is a Kan complex (in particular, its homotopy groups make sense). The Dold–Kan correspondence says that a simplicial abelian group may be identified with a chain complex. In fact it can be shown that any simplicial abelian group $A$ is non-canonically homotopy equivalent to a product of Eilenberg–MacLane spaces, $\prod _{i\geq 0}K(\pi _{i}A,i).$
  
  A commutative monoid in the category of simplicial abelian groups is a simplicial commutative ring.
  
  Eckmann (1945) discusses a simplicial analogue of the fact that a cohomology class on a Kähler manifold has a unique harmonic representative and deduces Kirchhoff's circuit laws from these observations.
  
  