Identity Element

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Is the following property exclusive to the identity elements: a- = a (inverse of a = a)?
 

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  • #2
Office_Shredder
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Nope. For example in Z2, the integers mod 2, you have two elements 0 and 1, and 1+1=0, so 1=-1
 
  • #3
1,179
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I see. Thanks for the reply.
 

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