| Front | What is the inverse element for an element a in the the group \((\mathbb Z , +)\) ? |
| Back | \(a^{-1} = -a\) |
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| Text | two cycles are called {{c1::disjoint}} if {{c2::they have no numbers in common}} |
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| Text | Since every group contains {{c1::an identity element}}, a group is always {{c2::nonempty}} |
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