
 Abelian group  Wikipedia, the free encyclopedia (Site not responding. Last check: 20071022) 
  In mathematics, an abelian group, also called a commutative group, is a group (G, *) such that a * b = b * a for all a and b in G. 
  If f, g : G → H are two group homomorphisms between abelian groups, then their sum f + g, defined by (f + g)(x) = f(x) + g(x), is again a homomorphism. 
  The abelian group, together with group homomorphisms, form a category, the prototype of an abelian category. 
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