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8. Let ๐บ be a group ith identity ๐‘’ suoh that ๐‘Ž2 = ๐‘’ for all ๐‘Ž โˆˆ ๐บ, then ๐บ is abelian.

Question

8. Let ๐บ be a group with identity ๐‘’ such that ๐‘Ž^2 = ๐‘’ for all ๐‘Ž โˆˆ ๐บ, then ๐บ is abelian.

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Solution

The statement is asking to prove that a group G with the property that the square of every element is the identity (a^2 = e for all a in G) is an abelian group. An abelian group is a group in which the result of performing the group operation on any two group elements does not depend on their order (i.e., the group operation is commutative).

Here is a step-by-step proof:

  1. Let a and b be any two elements in G. We want to show that ab = ba.

  2. Since (ab)^2 = e, we have abab = e.

  3. Multiplying both sides of abab = e on the right by a and b gives ababa = ea = a and ababb = eb = b.

  4. But ababa = a implies abab = a^-1 = a (since a^2 = e), and ababb = b implies abab = b^-1 = b (since b^2 = e).

  5. Therefore, we have ab = b^-1a^-1 = ba (since a^-1 = a and b^-1 = b), which shows that G is abelian.

This problem has been solved

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