Results 61 to 70 of about 298 (187)
A finiteness theorem for linear semigroups
, 1988 A classical theorem of Burnside on the finiteness of periodic linear groups is generalized to semigroups.
Yechezkel Zalcstein
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Maximal semigroups in finitely generated nilpotent groups
Proyecciones (Antofagasta), 2018 We obtain a classification of maximal subsemigroups of finitely generated nilpotent groups. In the principal results of this paper we show that there is a one-to-one correspondence between these subsemigroups and the non trivial homomorphisms of the group in R.
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Symmetrization and the rate of convergence of semigroups of holomorphic functions
Bulletin of the London Mathematical Society, Volume 58, Issue 4, April 2026.Abstract Let (ϕt)$(\phi _t)$, t⩾0$t\geqslant 0$, be a semigroup of holomorphic self‐maps of the unit disk D$\mathbb {D}$. Let Ω$\Omega$ be its Koenigs domain and τ∈∂D$\tau \in \partial \mathbb {D}$ be its Denjoy–Wolff point. Suppose that 0∈Ω$0\in \Omega$ and let Ω♯$\Omega ^\sharp$ be the Steiner symmetrization of Ω$\Omega$ with respect to the real axis.
Dimitrios Betsakos +1 more
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Remarks on embeddable semigroups in groups and a generalizationof some Cuthbert′s results [PDF]
International Journal of Mathematics and Mathematical Sciences, 2003 Let (U(t)) t≥0 be a C0‐semigroup of bounded linear operators on a Banach space X. In this paper, we establish that if, for some t0 > 0, U(t0) is a Fredholm (resp., semi‐Fredholm) operator, then (U(t)) t≥0 is a Fredholm (resp., semi‐Fredholm) semigroup.
Latrach, Khalid, Dehici, Abdelkader
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Noncommutative polygonal cluster algebras
Journal of the London Mathematical Society, Volume 113, Issue 4, April 2026.Abstract We define a new family of noncommutative generalizations of cluster algebras called polygonal cluster algebras. These algebras generalize the noncommutative surfaces of Berenstein–Retakh, and are inspired by the emerging theory of Θ$\Theta$‐positivity for the groups Spin(p,q)$\mathrm{Spin}(p,q)$.
Zachary Greenberg +3 more
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A group-theoretical interpretation of the word problem for free idempotent generated semigroups [PDF]
Advances in Mathematics, 2019 The set of idempotents of any semigroup carries the structure of a biordered set, which contains a great deal of information concerning the idempotent generated subsemigroup of the semigroup in question. This leads to the construction of a free idempotent generated semigroup $\mathsf{IG}(\mathcal{E})$ - the `free-est' semigroup with a given biordered ...
Gould, Victoria Ann Rosalind +2 more
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Multiple front and pulse solutions in spatially periodic systems
Journal of the London Mathematical Society, Volume 113, Issue 4, April 2026.Abstract In this paper, we develop a comprehensive mathematical toolbox for the construction and spectral stability analysis of stationary multiple front and pulse solutions to general semilinear evolution problems on the real line with spatially periodic coefficients.
Lukas Bengel, Björn de Rijk
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Generalized semigroups of quotients
, 1973 For S a semigroup with 0 and M S {M_S} a right S-set, certain classes of sub S-sets called right quotient filters are defined.
C. V. Hinkle
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Ergodic behavior of non-conservative semigroups via generalized Doeblin's conditions [PDF]
, 2019 International audienceWe provide quantitative estimates in total variation distance for positive semi-groups, which can be non-conservative and non-homogeneous.
Gabriel, Pierre +2 more
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Note on semigroups generated by positive Rockland operators on graded homogeneous groups [PDF]
Studia Mathematica, 1994 If \(L\) is a positive Rockland operator of homogeneous degree \(d\) on a graded homogeneous Lie group \(G\) and \((p_t)_{t > 0}\) the convolution kernel of the semigroup generated by \(L\) then the authors prove that for each left-invariant differential operator \(\partial\) on \(G\) of homogeneous degree \(j\) and all \(k \in \{0, 1, \ldots\}\) there
Dziubański, Jacek +2 more
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