An analogue of a theorem of Magnus
@article{Greendlinger1961AnAO, title={An analogue of a theorem of Magnus}, author={Martin Greendlinger}, journal={Archiv der Mathematik}, year={1961}, volume={12}, pages={94-96} }
In [2], W. MAGNUS proved tha t the normal closure of a cyclic subgroup of a free group determines the generator of the cyclic subgroup up to an inversion and a conjugation. He used this result to show that every Nielsen automorphism of a group with a single defining relator maps this defining relator onto a free transform of itself or of its inverse. In the present note, the number of s~nmbols in the word W will be called the length of W and will be denoted by l(W). I am grateful to Professor…
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