anonymous
  • anonymous
Let (G,*) be a group with identity element e such that a*a=e for all a in G. prove that G is abelian
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
Abstract algebra?
anonymous
  • anonymous
yep
anonymous
  • anonymous
Bleargh I don't know how to solve this. I will call upon @TuringTest and @FoolForMath for help. :P

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anonymous
  • anonymous
Although presumably if a*a=e, a is an identity element, and a group of identity elements are abelian? I don't know; I might be talking out of my retricehere.
anonymous
  • anonymous
If I may suggest a better place to ask advanced questions, http://math.stackexchange.com/ . The average advanced user here is probably a college math student. :P Abstract algebra isn't for everyone.
anonymous
  • anonymous
ok yea that web is another level.. let me see if they could help
anonymous
  • anonymous
Okay, this wasn't hard, \( a*a=e \implies a=a^{-1} \) similarly \( b=b^{-1} \) So, \[ a*b=(a*b)^{-1} =b^{-1} *a^{-1} =b*a. \]
anonymous
  • anonymous
[QED]
anonymous
  • anonymous
M.SE thread: http://math.stackexchange.com/questions/118772/

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