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Homomorphisms of commutator subgroups of braid groups with small number of strings
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For any $n$, we describe all endomorphisms of the braid group $B_n$ and of its commutator subgroup $B'_n$, as well as all homomorphisms $B'_n\to B_n$. These results are new only for small $n$ because endomorphisms of $B_n$ are already described by Castel for $n\ge 6$, and homomorphisms $B'_n\to B_n$ and endomorphisms of $B'_n$ are already described by Kordek and Margalit for $n\ge 7$. We use very different approaches for $n=4$ and for $n\ge 5$.
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Endomorphisms of Artin groups of type $\tilde A_n$
Classifies the endomorphisms of affine Artin groups of type Ã_n for n ≥ 4.
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