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Line 1: − In modern algebra, a '''group''' is a set of objects, together with a rule of composition, which obey certain rules.+ − − ==Definition== − − A group is a set of objects, sometimes referred to as <math>G \ </math>, and a rule of composition, <math>* \ </math>, such that − − − #For any two <math>x, y \in G \ </math>, their composition <math>x*y \in G \ </math>. − #For any three <math>x,y,z \in G, x*(y*z) = (x*y)*z \ </math> − − [[Category:Algebra Terms]]
Group (Mathematics) (view source)
Revision as of 22:59, November 24, 2009
, 22:59, November 24, 2009didn't realize page had already been made!
#REDIRECT [[Group (mathematics)]]
#There is an element of <math>G \ </math>, call it <math>e \ </math>, such that for any <math>x \ </math> in <math>G \ </math>, <math>e*x = x*e = x \ </math>. This element is called the identity of the group. We write <math>x \in G \ </math> to mean that <math>x \ </math> is in <math>G \ </math>.