Results 21 to 30 of about 96 (92)
The pseudovariety generated by completely 0-simple semigroups
Semigroup Forum, 1997 The author finds a finite pseudoidentity basis for the semigroup pseudovariety generated by all finite 0-simple semigroups. The basis consists of the following four pseudoidentities: (1) \((xy)^{\omega+1}x=xyx\); (2) \(x^{\omega+2}=x^2\); (3) \((xyz)^\omega xhz=xhz(xyz)^\omega\); (4) \((xy)^\omega xzx=xz(xy)^\omega x\).
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The kernel relation for an extension of completely 0-simple semigroups [PDF]
Glasgow Mathematical Journal, 1999 Congruences on regular semigroups can be described by means of their kernels and traces. This approach is adopted in this paper to study congruences on ideal extensions of completely \(0\)-simple semigroups by completely \(0\)-simple semigroups. In particular, the author obtains some detailed information on the congruence lattice of such a semigroup ...
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Some properties of completely 0-simple semigroups
上海师范大学学报. 自然科学版, 2013 We consider the properties of completely 0-simple semigroup S when the sandwich matrix P and G are Abelian， and generalize the corresponding results for completely simple semigroups.The elements of S are characterized if the subband of S is a left zero ...
CUI Jufen, ZHANG Jiangang
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Geometry of essential matrix ranges and the Smith–Ward problem for operator systems
Bulletin of the London Mathematical Society, Volume 58, Issue 9, September 2026.Abstract A d$d$‐tuple of bounded linear selfadjoint operators acting on an infinite‐dimensional separable Hilbert space is said to have the Smith–Ward property if the identity map of the image of the operator system in the Calkin algebra has a completely positive lift.
Douglas Farenick +2 more
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Free semigroups of large critical exponent
Journal of Topology, Volume 19, Issue 3, September 2026.Abstract For a convergence group equipped with an expanding coarse‐cocycle, we construct finitely generated free subsemigroups, which we call Bishop−−Jonessemigroups$\textit{Bishop--Jones semigroups}$, of critical exponent arbitrarily close to but strictly less than the critical exponent of the ambient group.
Aleksander Skenderi
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Higher representation stability for ordered configuration spaces
Journal of Topology, Volume 19, Issue 3, September 2026.Abstract Using factorization homology with coefficients in twisted commutative algebras (TCAs), we prove two flavors of higher representation stability for the cohomology of (generalized) configuration spaces of a scheme/topological space X$X$. First, we provide an iterative procedure to study higher representation stability using actions coming from ...
Quoc P. Ho
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Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic
Communications on Pure and Applied Mathematics, Volume 79, Issue 8, Page 1973-2102, August 2026.ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
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KdV limit for the Vlasov–Poisson–Landau system
Journal of the London Mathematical Society, Volume 114, Issue 2, August 2026.Abstract We are concerned with the fluid limit to KdV equations for the one‐dimensional Vlasov–Poisson–Landau system that describes the dynamics of ions in plasma with the electron density determined by the self‐consistent electric potential through the so‐called Boltzmann relation. Formally, it is well known that as the Knudsen number ε→0$\varepsilon \
Renjun Duan, Dongcheng Yang, Hongjun Yu
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On the theories classified by an étendue
Bulletin of the London Mathematical Society, Volume 58, Issue 7, July 2026.Abstract We give a model‐theoretic characterisation of the geometric theories classified by étendues—the ‘locally localic’ topoi. They are the theories where each model is determined, syntactically and semantically, by any witness of a fixed collection of formulae.
Joshua L. Wrigley
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Bidiagonal Ranks of Completely (0-)simple Semigroups
Journal of Siberian Federal University. Mathematics & Physics, 2016 Summary: A bidiogonal act over a semigroup is a two-sided act, where the semigroup acts on its Cartesian power. A bidiagonal rank of a semigroup is the least power of a generating set of the bidiagonal act over this semigroup. In this paper we compute bidiagonal ranks of completely (0-)simple semigroups.
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