The Equalizer Conjecture for the free group of rank two
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The equalizer of a set of homomorphisms S : F(a,b) → F(Δ) has rank at most two if S contains an injective map and is not finitely generated otherwise. This proves a strong form of Stallings’ Equalizer Conjecture for the free group of rank two. Results are also obtained for pairs of homomorphisms g,h : F(Σ) → F(Δ) when the images are inert in, or retracts of, F(Δ).
Logan , A D 2021 , ' The Equalizer Conjecture for the free group of rank two ' , Quarterly Journal of Mathematics , vol. Advance Article . https://doi.org/10.1093/qmath/haab059
Quarterly Journal of Mathematics
Copyright © The Author(s) 2021. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DescriptionFunding: This research was supported by Engineering and Physical Sciences Research Council (EPSRC) grant EP/R035814/1.
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