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What's the correct converse of this problem?
Attachment 26720
Which is the correct converse for the pictured question (so you can see the exact wording)?
Converse One: Take the converse of the statement agb=cgd always implies that ab=cd. That is:
Suppose G is a group with the property that ab=cd always implies agb=cgd. Prove or disprove G is abelian.
This seems like a kind of silly statement, and I see no way to prove it. The only way to make ab=cd is if a=c and b=d or if a=b=c=d.
Converse Two: Take the converse of the question. That is:
Suppose that G is an abelian group. Prove that G has the property that agb=cgd always implies ab=cd.
Which is too easy to be part (b) of this question. If G is abelian and agb=cgd, then we have
agb=cgd
gab=gcd
g-1gab=g-1gcd
ab=cd
Which means that G has that property.
TIA.
Re: What's the correct converse of this problem?
the wording of the question is vague, and i understand your confusion. however, i favor your "converse two" as the correct one.