Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2009/iii/paper-1/6/v/solution

False. Use the two-generated group constructed in part (iii) for a non-recursively-enumerable . Sending the two free generators to gives a surjective group homomorphism
The source is a finitely presented group, with presentation . The target is not finitely presented: if it were, its null words could be enumerated from a finite set of relators, and the tested commutators would enumerate , as proved in part (iii). Thus even a quotient of a rank-two free group need not admit a finite presentation. A quotient by a finitely normally generated kernel would be finitely presented, but the assertion places no such restriction on its kernel.

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