نتایج جستجو برای: universal semigroup compactification

تعداد نتایج: 115080  

2008
Johannes Kellendonk Mark V. Lawson

We study the universal groups of inverse semigroups associated with point sets and with tilings. We focus our attention on two classes of examples. The first class consists of point sets which are obtained by a cut and projection scheme (so-called model sets). Here we introduce another inverse semigroup which is given in terms of the defining data of the projection scheme and related to the mod...

Journal: :bulletin of the iranian mathematical society 2013
m. essmaili a. medghalchi

in the present paper, we consider biflatness of certain classes of semigroupalgebras. indeed, we give a necessary condition for a band semigroup algebra to bebiflat and show that this condition is not sufficient. also, for a certain class of inversesemigroups s, we show that the biflatness of ell^{1}(s)^{primeprime} is equivalent to the biprojectivity of ell^{1}(s).

2001
KŌTA YOSHIOKA

Let (X,H) be a pair of a smooth rational surface X and an ample divisor H on X . Assume that (KX , H) < 0. Let MH(r, c1, χ) be the moduli space of semi-stable sheaves E of rk(E) = r, c1(E) = c1 and χ(E) = χ. To consider relations between moduli spaces of different invariants is an interesting problem. If (c1, H) = 0 and χ ≤ 0, then Maruyama [Ma2], [Ma3] studied such relations and constructed a ...

2006
Ernie Manes

Restriction for Semigroups and Categories First afternoon talk of Calgary workshop Ernie Manes, June 2, 2006 This handout includes axiom systems useful for the talk, a very small set of definitions in category theory and a 12-step program to help semigroup theorists who have never studied category theory to get up to speed. The references at the end will be mentioned in the talk. Slogan: In the...

2017
APOORVA KHARE

We study probability inequalities leading to tail estimates in a general semigroup G with a translation-invariant metric dG . Using recent work [Ann. Prob., to appear] that extends the Hoffmann-Jørgensen inequality to all metric semigroups, we obtain tail estimates and approximate bounds for sums of independent semigroup-valued random variables, their moments, and decreasing rearrangements. In ...

2006
Gustavo Burdman Alex G. Dias

In the standard model in universal extra dimensions (UED) the mass of the Higgs field is driven to the cutoff of the higher-dimensional theory. This re-introduces a small hierarchy since the compactification scale 1/R should not be smaller than the weak scale. In this paper we study possible solutions to this problem by considering five-dimensional theories where the Higgs field potential vanis...

2006
E. GLASNER

We investigate new and old algebras of continuous functions on topological groups G arising from G-spaces and some associated linear representations G → Iso (V ) on Banach spaces V . The topological group G = H+[0, 1] of orientation preserving homeomorphisms on the closed interval does not admit non-trivial continuous representations G → Iso (V ) when V is a reflexive Banach space (an equivalen...

Journal: :Springer proceedings in mathematics & statistics 2021

Tetris is a popular puzzle video game, invented in 1984. We formulate two versions of the game as transformation semigroup and use this formulation to view through lens Krohn-Rhodes theory. In variation upon which it restarts if player loses, we find permutation group structures, including symmetric \(S_5\) contains non-abelian simple subgroup. This implies, at least case, that iterated finitar...

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