Talk:Additive inverse

Untitled
should read:
 * "In mathematics,..."
 * ... in an additively noted abelian group ...
 * ... opposite of ring elements (matrices, functions, ...)...
 * ... if there is a unit element (in K for a K-module), then -x = (-1)·x

Universal construction
"to do: symmetrization of an abelian semigroup"

-- Moved the above section to this page until it can be completed.

Meersan 22:43, 8 February 2006 (UTC)