BCI-代数的Fuzzy a-理想

本文的目的是引进PCI－代数的fuzzy α-理想的概念与探讨它的性质，给出了fuzzy α-理想的特征与Meng‘s扩张定理，讨论了BCI－代数中fuzzy α-理想，fuzzy q-理想与fuzzy p-理想之间的关系，从而得到一个BCI－代数的fuzzy子集是fuzzy α-理想当且仅当它是fuzzy q-理想与fuzzy p-理想。利用fuzzy α-理想与fuzzy p-理想分别刻画了结合BCI－代数与p-半单BCI－代数。此外，亦给出了fuzzy α-理想的其他性质。     

BCI-代数的Fuzzy广义结合理想

引入了BCI-代数的fuzzy广义结合理想的概念,给出了它的一种刻画,讨论了fuzzy广义结合理想与其它fuzzy理想的关系,并利用fuzzy广义结合理想得到了拟结合BCI-代数成为结合BCI-代数的几个特征。     

BCI代数的Ω-犹豫模糊P理想

给定一个集合Ω,在BCI代数中引入Ω-犹豫模糊P理想的概念,讨论它的一些性质,研究了Ω-犹豫模糊P理想的同态像与同态原像的性质;研究了BCI代数中的Ω-犹豫模糊P理想与犹豫模糊P理想的相互构造,通过Ω-犹豫模糊P理想的水平P理想,讨论了BCI代数中Ω-犹豫模糊P理想的刻画;研究了Ω-犹豫模糊P理想与乘积型BCI代数的Ω-犹豫模糊P理想的关系.     

BCH-代数的拟结合理想和拟结合模糊理想

在BCH-代数中,引入了拟结合理想和模糊拟结合理想的概念.研究了BCH-代数中模糊拟结合理想的相关性质,给出了BCH-代数拟结合理想的构造.     

BCH-代数的模糊理想与模糊H-理想

在BCK／BCI／BCC代数中Fuzzy理想被广泛研究，但在BCH-代数中还没有讨论过。在BCH-代数中引人了Fuzzy理想与FuzzyH-理想的概念，并讨论它们的性质。     

BCI代数的闭Ω犹豫模糊理想

在集合Ω中,把犹豫模糊集、Ω模糊集相结合来研究BCI-代数.首先在BCI代数中引入闭Ω犹豫模糊理想的概念,讨论它的一些性质和等价刻画;其次,在闭犹豫模糊理想概念的基础上研究了如何构造闭Ω犹豫模糊理想,讨论了闭Ω犹豫模糊理想的同态像与同态原像的性质;最后,给出了闭Ω犹豫模糊理想与乘积型BCI代数的闭Ω犹豫模糊理想的关系.     

BCH-代数的原子与分支

在BCH—代数中引入了原子与分支的概念，给出了一个元素为BCH-代数原子的一系列等价条件，证明了一个BCH—代数的所有原子作成的集合是一个广义结合BCI—代数，最后对BCH—代数分支的性质进行了讨论。     

半群的(∈,∈∨q(λ,μ))-模糊n伪理想与Drazin半群的刻画

给出半群的模糊n伪理想,广义模糊n伪理想,(∈,∈∨q(λ,μ))-模糊n伪理想的定义,同时讨论了(∈,∈∨q(λ,μ))-模糊n伪左理想(右理想,理想)和广义模糊n伪左理想(右理想,理想)的等价刻画.还利用半群的广义模糊子系统来刻画Drazin半群的结构.     

广义α—结合BCI—代数

引入了广义α－结合ＢＣＩ－代数的概念，研究了ＢＣＩ－代数的ｐ－半单部分与广义α－结合部分的关系。并将ｐ－半单ＢＣＩ－代数的若干重要性质推广到广义α－结合ＢＣＩ－代数上。最后我们证明了每个广义α－结合ＢＣＩ－代数可确定一个交换偏序幺半群。本文结果表明文［１］的正则ＢＣＩ－代数与ｐ－半单ＢＣＩ－代数是一致的。     

两类BCI—代数的结构特征

在[1]中有:BCI(K)—代数M=是拟左交错的,如果■x,y∈X,x≠y时有 x*(x*y)=(x*x)*yM是拟右交错的,如果?x,y∈X,x≠y时有     

亚BCI-代数及其理想

引入亚BCI-代数的概念,研究了它的基本性质.并在这类代数中引入并讨论了与BCI-代数类似的理想理论.     

Fuzzy Strongly Implicative Ideals in BCI－Algebras(Ⅱ)

For the homomorphic image f(μ) and preimage f-1(υ) of fuzzy strongly implicative ideals μ and υ,respectively, we establish the chains of level strongly implicative ideals of f(μ) and f-1(υ),respectively. We construct a new fuzzy strongly implicative ideal from old. Finally,we consider the normality of a fuzzy strongly implicative ideal in a BCI-algebra.     

Ideals and Subalgebras in BCI-Algebras

We prove that there exists a maximal ideal of a BCI-algebra X in which each subalgebra is an ideal.AMS Subject Classification (1991): 06F35, 03G25.The second author was supported by the LG Yonam Foundation (1995).     

Resolutions of Facet Ideals

Abstract

In this paper we study the resolution of a facet ideal associated with a special class of simplicial complexes introduced by Faridi. These simplicial complexes are called trees, and are a generalization (to higher dimensions) of the concept of a tree in graph theory. We show that the Koszul homology of the facet ideal I of a tree is generated by the homology classes of monomial cycles, determine the projective dimension and the regularity of I if the tree is 1-dimensional, show that the graded Betti numbers of I satisfy an alternating sum property if the tree is connected in codimension 1, and classify all trees whose facet ideal has a linear resolution.     

Construction of quotient BCI(BCK)-algebra via a fuzzy ideal

The present paper gives a new construction of a quotient BCI(BCK)-algebraX/μ by a fuzzy ideal μ inX and establishes the Fuzzy Homomorphism Fundamental Theorem. We show that if μ is a fuzzy ideal (closed fuzzy ideal) ofX, thenX/μ is a commutative (resp. positive implicative, implicative) BCK (BCI)-algebra if and only if μ is a fuzzy commutative (resp positive implicative, implicative) ideal ofX. Moreover we prove that a fuzzy ideal of a BCI-algebra is closed if and only if it is a fuzzy subalgebra ofX. We show that if the period of every element in a BCI-algebraX is finite, then any fuzzy ideal ofX is closed. Especially, in a well (resp, finite, associative, quasi-associative, simple) BCI-algebra, any fuzzy ideal must be closed.     

关于单BCI－代数的一些结果

本文讨论了单ＢＣＩ－代数．证明了一个ＢＣＩ－代数是单的当且仅当它的子代数都是单的；给出了单ｐ－半单ＢＣＩ－代数的一种表示式；证明了一个ｐ－半单ＢＣＩ－代数是单的当且仅当它的阶是素数；这样得到了一批（无限多个）单ＢＣＩ－代数；证明了商ＢＣＫ－代数Ｘ／Ａ是单的当且仅当Ａ是Ｘ的极大理想．     

Homomorphisms of Abelian pomonoids induced by a class of BCI-homomorphisms

In this paper, we investigate further the BCI-G part of a BCI-algebra and give a characterization of quasi-associative BCI-algebras in which every subalgebra is an ideal. Moreover, by using the G-part, we study the homomorphisms of abelian pomonoids induced by a quasi-associative BCI-homomorphism.     

Congruences and Ideals of Effect Algebras

This paper is devoted to a general investigation of congruences and ideals in effect algebras. One of our main results is the existence of an order isomorphism between Riesz congruences and Riesz ideals. We also answer an open question of Dvureenskij and Pulmannová by showing that an ideal is a Riesz ideal if and only if it is closed under generalized Sasaki projections.     

A method for group decision-making based on determining weights of decision makers using TOPSIS

In general, weights of decision makers (DMs) play a very important role in multiple attribute group decision-making (MAGDM), how to measure the weights of DMs is an interesting research topic. This paper presents a new approach for determining weights of DMs in group decision environment based on an extended TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) method. We define the positive ideal solution as the average of group decision. The negative ideal solution includes two parts: left and right negative ideal solution, which are the minimum and maximum matrixes of group decision, respectively. We give an example to illustrate the developed approach. Finally, the advantages and disadvantages of this study are also compared.