The given relations are
Substituting the values of c and d in (iii) we get
Substituting the value of a in (i) we get,
Substituting the value of c in (ii) we get
Thus we get , where denotes the cyclic group generated by.
Since A is an abelian generated by a,b,c,d then , and since . Thus we get . A cyclic group.
Feel free to comment if you have doubts. Cheers!
Let A be the abelian group with generators a, b, c, d and relations 2a 4b + с, 4c-d-2b and a + b + c + d-0. Write A as...
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