1 citations · 1 across the 4 of their papers we have counts for
4 papers
Pointlike sets with respect to ER
Karsten Henckell, Samuel Herman
We show that pointlike sets are decidable for the pseudovariety of finite semigroups whose idempotent-generated subsemigroup is R-trivial. Notably, our proof is constructive: we pr…
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…
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…
Orbits of Hamiltonian Paths and Cycles in Complete Graphs
Samuel Herman, Eirini Poimenidou
We enumerate certain geometric equivalence classes of subgraphs induced by Hamiltonian paths and cycles in complete graphs. Said classes are orbits under the action of certain dire…