We observe that the results of Feighn-Handel and Geoghegan-Mihalik-Sapir-Wise about coherence and Hopficity of mapping tori of injective endomorphisms of free groups extend to non-injective endomorphisms.
On Eigenvalues of Free Group Endomorphisms
The dynamics and geometry of free group endomorphisms
Polynomial maps over $p$-adics and residual properties of mapping tori of group endomorphisms
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