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## Homework Statement

G is a commutative group, prove that the elements of order 2 and the identity element e form a subgroup.

## Homework Equations

## The Attempt at a Solution

I don't know where to even begin.

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- Thread starter HuaYongLi
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- #1

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G is a commutative group, prove that the elements of order 2 and the identity element e form a subgroup.

I don't know where to even begin.

- #2

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- #3

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What I'm having trouble with is closure, proving that for any elements a and b in the group, ab is also in the group.

- #4

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Thank You

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