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1.
Moosa GABELEH 《数学物理学报(B辑英文版)》2014,(5):1661-1669
We study the existence of best proximity points for single-valued non-self map-pings. Also, we prove a best proximity point theorem for set-valued non-self mappings in metric spaces with an appropriate geometric property. Examples are given to support the usability of our results. 相似文献
2.
In this paper we obtain the following main results. The ordered semigroups which have the P-property are decomposable into archimedean semigroups. Moreover, they are decomposable into semigroupswith the P-property. Conversely, if an ordered semigroup S is a complete semilattice of semigroups which have the P-property, then S itself also has the P-property. An ordered semigroup is CS-indecomposable and has the P-property if and only if it is archimedean. If S is an ordered semigroup, then the relation N:= {(a, b) | N(a) = N(b)} (here N(a) is a filter of S generated by a (a ∈ S)) is the least complete semilattice congruence on S and the class (a)
N
is a CS-indecomposable subsemigroup of S for each a ∈ S. We introduce the notion of the P
m
-property and describe it in terms of the P-property. Our approach simplifies the proofs of the corresponding results about unordered semigroups.
The text was submitted by the authors in English. 相似文献
3.
陈维新 《浙江大学学报(理学版)》2000,27(2):167-170
本文在 Γ-环中继续研究由元素性质确定的根性质 .首先证明了文献 [1]中主要定理的逆定理 , 从而使满足某些条件的元素所具有的性质 P与根性质 R可互相确定 .进而讨论确定的唯一性问题.利用 这些结果可得出 Γ-环的 Baer根是由元素的 m-幂零性所确定的根. 相似文献
4.
Given a linear transformation L:?
n
→?
n
and a matrix Q∈?
n
, where ?
n
is the space of all symmetric real n×n matrices, we consider the semidefinite linear complementarity problem SDLCP(L,?
n
+,Q) over the cone ?
n
+ of symmetric n×n positive semidefinite matrices. For such problems, we introduce the P-property and its variants, Q- and GUS-properties. For a matrix A∈R
n×n
, we consider the linear transformation L
A
:?
n
→?
n
defined by L
A
(X):=AX+XA
T
and show that the P- and Q-properties for L
A
are equivalent to A being positive stable, i.e., real parts of eigenvalues of A are positive. As a special case of this equivalence, we deduce a theorem of Lyapunov.
Received: March 1999 / Accepted: November 1999?Published online April 20, 2000 相似文献
5.
《数学研究通讯:英文版》2016,(3):229-240
Fixed point and common fixed point results for mappings satisfying quasi-contractive conditions expressed in the terms of c-distance on TVS-valued cone met-ric spaces (without the underlying cone which is not normal) are obtained, and P-property and Q-property for mappings in the terms of c-distance are discussed. Our results generalize and improve many known results. 相似文献
6.
Given a graph G, a proper labelingf of G is a one-to-one function from V(G) onto {1,2,…,|V(G)|}. For a proper labeling f of G, the profile widthwf(v) of a vertex v is the minimum value of f(v)−f(x), where x belongs to the closed neighborhood of v. The profile of a proper labelingfofG, denoted by Pf(G), is the sum of all the wf(v), where v∈V(G). The profile ofG is the minimum value of Pf(G), where f runs over all proper labeling of G. In this paper, we show that if the vertices of a graph G can be ordered to satisfy a special neighborhood property, then so can the graph G×Qn. This can be used to determine the profile of Qn and Km×Qn. 相似文献
7.
陈维新 《浙江大学学报(理学版)》2000,27(2)
本文在Γ -环中继续研究由元素性质确定的根性质 .首先证明了文献 [1 ]中主要定理的逆定理 ,从而使满足某些条件的元素所具有的性质 P与根性质 R可互相确定 .进而讨论确定的唯一性问题 .利用这些结果可得出Γ -环的 Baer根是由元素的 m-幂零性所确定的根 . 相似文献
8.
We study the existence of best proximity points for single-valued non-self mappings. Also, we prove a best proximity point theorem for set-valued non-self mappings in metric spaces with an appropriate geometric property. Examples are given to support the usability of our results. 相似文献
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