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arXiv 2103.11387math.LOmath.RA
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双布尔代数的拓扑表示

Topological Representation of Double Boolean Algebras

Prosenjit Howlader, Mohua Banerjee

摘要:

在形式概念分析中,任何上下文的原概念的集合形成完全上下文的双布尔代数(dBa)。上下文的半概念形成纯dBa。本文是一个研究的拓扑表示结果的dBAs,特别是那些完全上下文和纯dBAs。在这项工作中,上下文拓扑空间(CTS)被认为是,重点是在一种特殊的CTS,其中的关系定义的上下文以及逆的关系是连续的拓扑。这样的CTS被表示为CTSCR。据观察,封闭式面向对象的原型概念的CTSCR形成一个完全上下文的dBa,而封闭式面向对象的概念形成一个纯粹的dBa。每个dBa被证明是准嵌入到dBa的一个特定的CTSCR的面向对象的原型概念的Clopen。在上下文dBa的情况下,准嵌入变成嵌入,并且当dBa是完全上下文的时,准嵌入变成同构。对于纯dBas,人们获得了与CTSCR的面向对象的闭包代数的同构。有限dBas和布尔代数的表示也在这个过程中解决。这个CTSCR的属性的抽象导致Stone上下文的定义。Stone上下文和CTSCR-同胚被看作形成一个范畴,记为Scxt。此外,dBa同构和CTSCR-同胚之间的对应关系。这激发了对dBas的范畴二元性的研究,构成了文章的第二部分。纯dBas和完全上下文dBas以及dBa同构形成类别,分别表示为PDBA和FCDBA。建立了PDBA等价于FCDBA,而FCDBA和PDBA双重等价于Scxt。

英文摘要:

In formal concept analysis, the collection of protoconcepts of any context forms a double Boolean algebra (dBa) which is fully contextual. Semiconcepts of a context form a pure dBa. The present article is a study on topological representation results for dBas, and in particular, those for fully contextual and pure dBas. In this work, a context on topological spaces (CTS) is considered, and the focus is on a special kind of CTS in which the relation defining the context as well as the converse of the relation are continuous with respect to the topologies. Such CTS are denoted as CTSCR. It is observed that clopen object oriented protoconcepts of a CTSCR form a fully contextual dBa, while clopen object oriented semiconcepts form a pure dBa. Every dBa is shown to be quasi-embeddable into the dBa of clopen object oriented protoconcepts of a particular CTSCR. The quasi-embedding turns into an embedding in case of a contextual dBa, and into an isomorphism, when the dBa is fully contextual. For pure dBas, one obtains an isomorphism with the algebra of clopen object oriented semiconcepts of the CTSCR. Representation of finite dBas and Boolean algebras are also addressed in the process. Abstraction of properties of this CTSCR leads to the definition of Stone contexts. Stone contexts and CTSCR- homeomorphisms are seen to form a category, denoted Scxt. Furthermore, correspondences are observed between dBa isomorphisms and CTSCR-homeomorphisms. This motivates a study of categorical duality of dBas, constituting the second part of the article. Pure dBas and fully contextual dBas along with dBa isomorphisms form categories, denoted PDBA and FCDBA respectively. It is established that PDBA is equivalent to FCDBA, while FCDBA and PDBA are dually equivalent to Scxt.

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