Talk:Category of groups

From Wikipedia, the free encyclopedia

Mathematics Portal This article is within the scope of WikiProject Mathematics, which collaborates on articles related to mathematics.
Mathematics rating:	Stub Class	Mid Priority	Field: Algebra
Please update this rating as the article progresses, or if the rating is inaccurate. Click to show/hide comments. Please add to or update the comments to suggest improvements to the article. Geometry guy 20:26, 21 May 2007 (UTC)

Other than having to be careful about what is meant by the cokernel in Gp is there actually anything that prevents the Snake Lemma from working?

The complicated endomorphism example shows that no definition of addition makes the hom sets into a group suitable for an additive category. The 1+1=2 assumes a definition of addition (the one used for the near ring of endormorphisms, aka the natural definition). The whole point of the example is to show that even if the addition is not natural, it cannot exist. JackSchmidt 21:02, 3 August 2007 (UTC)