[代數] 代數學習題疑惑
小弟昨天學完abeliean group & subgroup.隨即挑了一個習題來做練習.
在做代數學習題的時候發現我看到題目後不知道如何下手,煩請各位指教.
ex.Prove that if G is an abeliean group with identity e,then all elements
x of G satisfying x^2=e form a subgroup of G.
例如遇到這個習題,我就把abeliean group的定義寫下來,
再假設一個非空集合H是G的subgroup.(有錯煩請指正.)
總而言之,我會寫下題目所有的資訊,但我不懂該如何串聯起來.
煩請各位代數前輩指教!
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