On Induced Mappings

ＯｎＩｎｄｕｃｅｄＭａｐｐｉｎｇｓＣｕｉＨｏｎｇｂｉｎＦａｎＬｅｉＺｈｅｎｇＣｈｏｎｇｙｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＣａｐｉｔａｌＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ，１０００３７）ＡｂｓｔｒａｃｔＬｅｔＸｂｅ...     

Variational Inclusions for Fuzzy Mappings

§１．　ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｄｄｉｑｉａｎｄＡｎｓａｒｉ［４］ｄｅｖｅｌｏｐｅｄｉｔｅｒａｔｉｖｅａｌｇｏｒｉｔｈｍｓｆｏｒｆｉｎｄｉｎｇａｐｐｒｏｘｉｍａｔｅｓｏｌｕｔｉｏｎｔｏｎｅｗｃｌａｓｓｅｓｏｆｑｕａｓｉｖａｒｉａｔｉｏｎａｌｉｎｅｑｕａｌｉｔｉｅｓｉｎＨｉｌｂｅｒｔｓｐａｃｅｓ，ＨａｓｓｏｕｎｉａｎｄＭｏｕｄａｆｉ［１］ｅｘｔｅｎｄｔｈｅｍａｉｎｉｄｅａｓｏｆｐａｐｅｒ［４］ｔｏｍｏｒｅｇｅｎｅｒａｌｃａｓｅｓ，ｗｈｉｃｈｃｏｎｓｉｄｅｒｅｄａｃｌａｓｓｏｆｖａｒｉａｔｉｏｎ…     

N-Centralizing Mappings in Semiprime Rings

Ｎ┐ＣｅｎｔｒａｌｉｚｉｎｇＭａｐｐｉｎｇｓｉｎＳｅｍｉｐｒｉｍｅＲｉｎｇｓＭａｊｅｅｄ，Ａ．Ｈ．ａｎｄＮｉｕＦｅｎｇｗｅｎ（牛凤文）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＪｉｌｉｎＵｎｉｖｅｒｓｉｔｙ，Ｃｈａｎｇｃｈｕｎ，１３００２３）...     

On Strong Sequence-Covering Compact Mappings

ＯｎＳｔｒｏｎｇＳｅｑｕｅｎｃｅ┐ＣｏｖｅｒｉｎｇＣｏｍｐａｃｔＭａｐｐｉｎｇｓＹａｎＰｅｎｇｆｅｉ（燕鹏飞）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＡｎｈｕｉＵｎｉｖｅｒｓｉｔｙ，Ｈｅｆｅｉ，２３００３９）ＡｂｓｔｒａｃｔＩｎｔｈｉｓｐａ...     

Additive Mappings Preserving Rank-one Idempotents

A complete characterization of additive mappings φ ： B（X）→B（Y）, which map rank-one idempotents to themselves or to zero, is given.     

Vector Minimization of Upper Robust Mappings

1.IntroductionLetXbeatopologicalspaceandf=(f',f',...):X-Reamapping.Inthispaper,weconsiderthevectoroptimizationproblemswithrespecttothepartialorderinginducedb}'thenonnegativeorthantoftheproductspaceRe.Apointx6Xissaidtobeaegcientsolutionornondominatedsoluti…     

Mappings of BMO–bounded distortion

Received: 24 November 1998 / Accepted: 20 October 1999 / Published online: 28 June 2000     

On Open and α-Covering Mappings

We prove that an open mapping of compact metric spaces can be made α-covering if the metric of the image is changed. An example is given in which this cannot be achieved by changing the metric in the departure space.     

Extension of Proper _-holom orphic Mappings

§１．　ＩｎｔｒｏｄｕｃｔｉｏｎＩｆＤ１，Ｄ２ａｒｅｔｗｏｓｍｏｏｔｈｂｏｕｎｄｅｄｐｓｅｕｄｏｃｏｎｖｅｘｄｏｍａｉｎｓｉｎＣｎ，Ｄ１ｓａｔｉｓｆｉｅｓｔｈｅｃｏｎｄｉｔｉｏｎＲ（ｓｅｅ［１］），ｉｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔａｎｙｂｉｈｏｌｏｍｏｒｐｈｉｃｍａｐｐｉｎｇｆ：Ｄ１→Ｄ２ｅｘｔｅｎｄｓｓｍｏｏｔｈｌｙｔｏｔｈｅｂｏｕｎｄａｒｙ．Ｔｈｉｓｒｅｓｕｌｔｈａｓｂｅｅｎｇｅｎｅｒａｌｉｚｅｄｔｏｔｈｅｃａｓｅｓｏｆｐｒｏｐｅｒｈｏｌｏｍｏｒｐｈｉｃｍａｐｐｉｎｇｓ（［２］）．Ｉｎｔｈ…     

Quasiconformal Mappings and Weakly John Domains

Let D be a bounded domain in R~2 and c(≥1)be a constant.We say that D is a c-Johndomain if there exists x_0∈D such that for any x∈D,there must be a rectifiable curve γDwhich joins x and x_0,satisfying l(γ(x,y))≤cd(y,D)for any y ∈γ,where l(γ(x,y))denotesthe Euclidean length of the subcurce γ between x and y,d(y,D)is the Euclidean distance fromy to the boundary D of D.We say that D is a John domain if D is a c-John domain for some     

Nearly Quartic Mappings in β-Homogeneous F-Spaces

In this paper, we investigate the Hyers–Ulam stability of the following quartic equation $$\begin{array}{ll} {\sum\limits^{n}_{k=2}}\left({\sum\limits^{k}_{i_{1}=2}}{\sum\limits^{k+1}_{i_{2}=i_{1}+1}} \ldots {\sum\limits^{n}_{i_{n-k+1}=i_{n-k}+1}}\right)\\ \quad\times f \left({\sum\limits^{n}_{i=1,i \neq i_{1},\ldots,i_{n-k+1}}} x_{i}-{\sum\limits^{n-k+1}_{r=1}}x_{i_{r}}\right) + f \left({\sum\limits^{n}_{i=1}}x_{i}\right)\\ \quad-2^{n-2}{\sum\limits^{}_{1 \leq{i} \leq{j} \leq{n}}}(f(x_{i} + x_{j}){+f(x_{i} - x_{j})){+2^{n-5}(n - 2){\sum\limits^{n}_{i=1}}f(2x_{i})}} = \theta \end{array} $$ $({n \in \mathbb{N}, n \geq 3})$ in β-homogeneous F-spaces.     

On Ekeland's Variational Principle for Set-Valued Mappings

In this paper,we derive a general vector Ekeland variational principle for set-valued mappings,which has a closed relation to εk~O-efficient points of set-valued optimization problems.The main result presentedin this paper is a generalization of the corresponding result in[3].     

Invariant Curves of Reversible Mappings with Small Twist

In this paper,we are concerned with the existence of invariant curves of reversible mappings.A variant of the classical small twist theorem is given.     

(K, K′)-quasiconformal Harmonic Mappings

We prove that a harmonic diffeomorphism between two Jordan domains with C ² boundaries is a (K, K′) quasiconformal mapping for some constants K ≥ 1 and K′ ≥ 0 if and only if it is Lipschitz continuous. In this setting, if the domain is the unit disk and the mapping is normalized by three boundary points condition we give an explicit Lipschitz constant in terms of simple geometric quantities of the Jordan curve which surrounds the codomain and (K, K′). The results in this paper generalize and extend several recently obtained results.     

Uniqueness Theorem of Meromorphic Mappings with Moving Targets

Some uniqueness theorems of meromorphic mappings with moving targets are given under the inclusion relations between the zeros sets of meromorphic mappings.     

An ε-Minimax Theorem for Bi-Lower-Semicontinuous Set-Valued Mappings

In this article, an approximate minimax theorem for bi-lower-semicontinuous set-valued mapping was proved, relationships between semicontinuous set-valued mappings are discussed and the existence of approximate maxmin was given. The minimax theorem in this article is the first minimax theorem that doesn’t require the set-valued mappings to be continuous.     

A Topological Degree for Multivalued Generalized A-proper Mappings

The aim of this note gives a generalization of the degree theory for single valued G-A-proper mappings of [4] and a degree theory for multivalued G-A-proper mappings. Let (X,Y) be a pair of separable Banach spaces with given approximation scheme {X_n, Y_n, Q_n} ([2] Section2). Let D be an open bounded subset of X.     

An abnormalτ-meson decay

An unusual example of aτ ⁺-meson decay in nuclear emulsions is described. From the measurements made on the momenta and direction of the threeπ-mesons emitted, the event is interpreted as a decay of aτ-meson according to the scheme:

$$\tau ^ + \to \underline {\pi ^ + + \pi ^ + + \pi ^ - + \gamma } + Q$$     

τ-Categories I: Ladders

In this series of papers, we introduce τ-categories, which are additive categories with some kind of Auslander–Reiten sequences. We apply them to study the category of lattices over orders. In this first paper, we study minimal projective resolutions in functor categories over τ-categories. Then we give a structure theorem of completely graded τ-categories using mesh categories. Presented by K. Roggenkamp Mathematics Subject Classifications (2000) primary 16G30; secondary 16E65, 16G70, 18E05. Osamu Iyama: Current address: Department of Mathematics, University of Hyogo, Himeji, 671-2201, Japan. e-mail: iyama@sci.u-hyogo.ac.jp.