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math.GR2021
Product Expansions Redux
Karsten Henckell, Samuel Herman
We introduce a generalization of the product expansion of a finite semigroup. As an application, we provide an alternative proof of the decidability of pointlike sets for pseudovar…
math.GR2021
A General Theory of Pointlike Sets
Karsten Henckell, Samuel Herman
We introduce a general unifying framework for the investigation of pointlike sets. The pointlike functors are considered as distinguished elements of a certain lattice of subfuncto…