[代數] 一題group的證明@@

[paggei (XD)]

(G,*,e)為一群，想證                                         j
                     -1   r                       j      -j   r
    if a, b∈G, b*a*b  = a  for some r∈Ｎ, then b * a * b = a  for all j∈Ｎ

麻煩各位QQ

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→ Zroyden     :Try j=2,3.   By induction