Results 41 to 50 of about 5,621,789 (82)

Presentations of inverse semigroups, their kernels and extensions [PDF]

, 2011
"Part of this work was done while Gray was an EPSRC Postdoctoral Research Fellow at the University of St Andrews, Scotland"Let S be an inverse semigroup and let π:S→T be a surjective homomorphism with kernel K.
Ruskuc, Nik, Gray, Robert, Carvalho, Catarina, CATARINA CARVALHO, Gray, R, Gray, Robert D., NIK RUSKUC, ROBERT D. GRAY, Carvalho, C.A.   +8 more
core   +1 more source

Automatic presentations for semigroups [PDF]

, 2012
Special Issue: 2nd International Conference on Language and Automata Theory and Applications (LATA 2008)This paper applies the concept of FA-presentable structures to semigroups.
Cain, Alan James, Oliver, Graham, Ruskuc, Nik, Thomas, Richard M.   +3 more
core   +2 more sources

Finite models for positive combinatorial and exponential algebra

Bulletin of the London Mathematical Society, Volume 57, Issue 11, Page 3380-3400, November 2025.
Abstract We use high girth, high chromatic number hypergraphs to show that there are finite models of the equational theory of the semiring of non‐negative integers whose equational theory has no finite axiomatisation, and show this also holds if factorial, fixed base exponentiation and operations for binomial coefficients are adjoined.
Tumadhir Alsulami, Marcel Jackson
wiley   +1 more source

On the growth of generating sets for direct powers of semigroups [PDF]

, 2011
For a semigroup S its d-sequence is d(S) = (d1, d2, d3, . . .), where di is the smallest number of elements needed to generate the ith direct power of S.
J. T. Hyde, Wallis, Alistair; id_orcid, Ruskuc, Nik, Loughlin, Nicholas J., N. J. Loughlin, Wallis, Alistair, Quick, Martyn, N. Ruškuc, A. R. Wallis, M. Quick, Hyde, James T., Hyde, James Thomas, Loughlin, Nicholas   +12 more
core   +1 more source

On Endomorphism Universality of Sparse Graph Classes

Journal of Graph Theory, Volume 110, Issue 2, Page 223-244, October 2025.
ABSTRACT We show that every commutative idempotent monoid (a.k.a. lattice) is the endomorphism monoid of a subcubic graph. This solves a problem of Babai and Pultr and the degree bound is best‐possible. On the other hand, we show that no class excluding a minor can have all commutative idempotent monoids among its endomorphism monoids. As a by‐product,
Kolja Knauer, Gil Puig i Surroca
wiley   +1 more source

A coboundary Temperley–Lieb category for sl2$\mathfrak {sl}_{2}$‐crystals

Journal of the London Mathematical Society, Volume 112, Issue 3, September 2025.
Abstract By considering a suitable renormalization of the Temperley–Lieb category, we study its specialization to the case q=0$q=0$. Unlike the q≠0$q\ne 0$ case, the obtained monoidal category, TL0(k)$\mathcal {TL}_0(\mathbb {k})$, is not rigid or braided. We provide a closed formula for the Jones–Wenzl projectors in TL0(k)$\mathcal {TL}_0(\mathbb {k})$
Moaaz Alqady, Mateusz Stroiński
wiley   +1 more source

Traces on the uniform tracial completion of Z$\mathcal {Z}$‐stable C∗${\rm C}^*$‐algebras

Journal of the London Mathematical Society, Volume 111, Issue 6, June 2025.
Abstract The uniform tracial completion of a C∗${\rm C}^*$‐algebra A$A$ with compact trace space T(A)≠∅$T(A) \ne \emptyset$ is obtained by completing the unit ball with respect to the uniform 2‐seminorm ∥a∥2,T(A)=supτ∈T(A)τ(a∗a)1/2$\Vert a\Vert _{2,T(A)}=\sup _{\tau \in T(A)} \tau (a^*a)^{1/2}$. The trace problem asks whether every trace on the uniform
Samuel Evington
wiley   +1 more source

Subgroups of free idempotent generated semigroups: full linear monoid

, 2010
We hope to use similar methods to study the higher rank ...
Brittenham, Mark, Margolis, Stuart W., Meakin, John   +2 more
openaire   +2 more sources

Unipotency of Matrix Group Generated by Two Matrices

Journal of Applied Mathematics, Volume 2025, Issue 1, 2025.
In this paper, the problem of unipotency for the matrix group generated by two matrices is examined. By employing matrix logarithms as a tool, various combinatorial formulas for matrices were derived by selecting different primitive elements. Key conclusions were then reached through the organization and simplification of these formulas.
Yanshuo Cheng, Xinsong Yang, Kamal Kumar
wiley   +1 more source

Weak ω‐Approximate Biprojectivity of Banach Algebras

Journal of Mathematics, Volume 2025, Issue 1, 2025.
For a given Banach algebra M and a continuous endomorphism ω on M, we define weakly ω‐approximately biprojective and weakly ω‐approximately Helemskii biflat Banach algebras. We then examine the relationship between them and express the correlation between them and ω‐pseudoamenability.
Zahra Ghorbani, Elena Guardo
wiley   +1 more source