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## Comments

## commutativity

According to the entry "prime ring", cancellation rings must also be commutative. Either my entry or this entry should be edited so that the statements match.

## Re: commutativity

A comparison with cancellative semigroups suggest

that commutativity is not essential for cancellation.

## Re: commutativity

Then what is the difference, if any, between a prime ring and a cancellation ring?