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McEliece's freeness conjecture for maximal subgroups of free idempotent generated semigroups
McEliece's conjecture. Each maximal subgroup of any semigroup of the form $\ig{E}$ is a free group.
Conjecturerefutedbiordered-sets free-groups semigroup-theoryarXiv posted 2 days ago

McEliece's freeness conjecture for maximal subgroups of free idempotent generated semigroups