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- W4281746169 abstract "We describe the pronilpotent quotients of a class of projective profinite groups, that we call $omega$-presented groups, defined using a special type of presentations. The pronilpotent quotients of an $omega$-presented group are completely determined by a single polynomial, closely related with the characteristic polynomial of a matrix. We deduce that $omega$-presented groups are either perfect or admit the $p$-adic integers as quotients for cofinitely many primes. We also find necessary conditions for absolute and relative freeness of $omega$-presented groups. Our main motivation comes from semigroup theory: the maximal subgroups of free profinite monoids corresponding to primitive substitutions are $omega$-presented (a theorem due to Almeida and Costa). We are able to show that the incidence matrix of a primitive substitution carries partial information on the pronilpotent quotients of the corresponding maximal subgroup. We apply this to deduce that the maximal subgroups corresponding to primitive aperiodic substitutions of constant length are not absolutely free." @default.
- W4281746169 created "2022-06-13" @default.
- W4281746169 creator A5001091827 @default.
- W4281746169 date "2022-09-01" @default.
- W4281746169 modified "2023-10-18" @default.
- W4281746169 title "Pronilpotent quotients associated with primitive substitutions" @default.
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- W4281746169 doi "https://doi.org/10.1016/j.jalgebra.2022.05.021" @default.
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