20.68 (2022)

Open

The submonoid membership problem for a group $G$ generated by an alphabet $A$ asks, for given words $x_1, x_2, \dots, x_n$ and a word $w$ over $A$, whether $w$ belongs to the submonoid of $G$ generated by the $x_i$. Does there exist a hyperbolic one-relator group with undecidable submonoid membership problem?

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