Semigroups and de Leeuw’s convexity theorem
نویسندگان
چکیده
منابع مشابه
Ashs Theorem, Finite Nilpotent Semigroups, and One-Dimensional Tiling Semigroups
This is the manuscript for a talk given at CAUL (19 October, 2001) and also at Northern Illinois University (26 July, 2002). I am grateful to CAUL for their generous support during my visit there in October/November 2001) and to the Department of Mathematical Sciences at NIU (in particular to W.D. Blair) for the mini-conference on the occasion my my retirement.
متن کاملAnisimov's Theorem for inverse semigroups
The idempotent problem of a finitely generated inverse semi-group is the formal language of all words over the generators representing idempotent elements. This note proves that a finitely generated inverse semigroup with regular idempotent problem is necessarily finite. This answers a question of Gilbert and Noonan Heale, and establishes a gen-eralisation to inverse semigroups of Anisimov's Th...
متن کاملA Convexity Theorem and Reduced Delzant Spaces
The convexity theorem of Atiyah and Guillemin-Sternberg says that any connected compact manifold with Hamiltonian torus action has a moment map whose image is the convex hull of the image of the fixed point set. Sjamaar-Lerman proved that the Marsden-Weinstein reduction of a connected Hamitonian G-manifold is a stratified symplectic space. Suppose 1 → A → G → T → 1 is an exact sequence of compa...
متن کاملDavis’ Convexity Theorem and Extremal Ellipsoids
We give a variety of uniqueness results for minimal ellipsoids circumscribing and maximal ellipsoids inscribed into a convex body. Uniqueness follows from a convexity or concavity criterion on the function used to measure the size of the ellipsoid. Simple examples with non-unique minimal or maximal ellipsoids conclude this article. MSC 2000: 52A27, 52A20
متن کاملThe starlikeness, convexity, covering theorem and extreme points of p-harmonic mappings
The main aim of this paper is to introduce three classes $H^0_{p,q}$, $H^1_{p,q}$ and $TH^*_p$ of $p$-harmonic mappings and discuss the properties of mappings in these classes. First, we discuss the starlikeness and convexity of mappings in $H^0_{p,q}$ and $H^1_{p,q}$. Then establish the covering theorem for mappings in $H^1_{p,q}$. Finally, we determine the extreme points of the class $TH^*_{p}$.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the American Mathematical Society
سال: 1966
ISSN: 0002-9939
DOI: 10.1090/s0002-9939-1966-0203521-x