The nonfinite generation of 𝐴𝑢𝑡(𝐺), 𝐺 free metabelian of rank 3

The nonfinite generation of $\textrm {Aut}(G)$, $G$ free metabelian of rank $3$
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by S. Bachmuth and H. Y. Mochizuki PDF

Trans. Amer. Math. Soc. 270 (1982), 693-700 Request permission

The group of automorphisms of the free metabelian group of rank $3$ is not finitely generated.

References

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Arbres, amalgames