{"title":"Commutative Objects, Central Morphisms and Subtractors in Subtractive Categories","authors":"Vaino Tuhafeni Shaumbwa","doi":"10.1007/s10485-023-09715-2","DOIUrl":"10.1007/s10485-023-09715-2","url":null,"abstract":"<div><p>We give some characterizations of commutative objects in a subtractive category and central morphisms in a regular subtractive category. In particular, we show that commutative objects, i.e., internal unitary magmas, are the same as internal abelian groups in a subtractive category and that analogously, centrality has an alternative description in terms of so-called “subtractors” in a regular subtractive category.</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-023-09715-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45820524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some Modifications of Hull Operators in Archimedean Lattice-Ordered Groups with Weak Unit","authors":"Ricardo E. Carrera, Anthony W. Hager","doi":"10.1007/s10485-023-09710-7","DOIUrl":"10.1007/s10485-023-09710-7","url":null,"abstract":"<div><p><span>({textbf {W}})</span> denotes the category, or class of algebras, in the title. A hull operator (ho) in <span>({textbf {W}})</span> is a function <span>(textbf{ho} {textbf {W}}overset{h}{longrightarrow } {textbf {W}})</span> which can be called an essential closure operator. The family of these, denoted <span>(textbf{ho} {textbf {W}})</span>, is a proper class and a complete lattice in the ordering as functions “pointwise\", with the bottom <span>({{,textrm{Id},}}_{{textbf {W}}})</span> and top Conrad’s essential completion <i>e</i>. Other much studied hull operators are the divisible hull, maximum essential reflection, projectable hull, and Dedekind completion. This paper is the authors’ latest efforts to understand/create structure in <span>(textbf{ho} {textbf {W}})</span> through the nature of the interaction that an <i>h</i> might have with <i>B</i>, the bounded monocoreflection in <span>({textbf {W}})</span> (e.g., Bh=hB). We define and investigate three functions <span>(textbf{ho} {textbf {W}}longrightarrow textbf{ho} {textbf {W}})</span> which stand in the relation </p><div><div><span>$$begin{aligned} {{,textrm{Id},}}_{{textbf {W}}} le overline{alpha }(h) le overline{lambda }(h) le overline{c}(h) le h. end{aligned}$$</span></div></div><p>General properties that an <i>h</i> might have, and particular choices of <i>h</i>, show various assignments of < and <span>(=)</span> in this chain.\u0000</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-023-09710-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42171580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Admissibility of Localizations of Crossed Modules","authors":"Olivia Monjon, J. Scherer, Florence Sterck","doi":"10.1007/s10485-023-09738-9","DOIUrl":"https://doi.org/10.1007/s10485-023-09738-9","url":null,"abstract":"","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"0 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52044402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Descent for internal multicategory functors","authors":"Rui Prezado, Fernando Lucatelli Nunes","doi":"10.1007/s10485-022-09706-9","DOIUrl":"10.1007/s10485-022-09706-9","url":null,"abstract":"<div><p>We give sufficient conditions for effective descent in categories of (generalized) internal multicategories. Two approaches to study effective descent morphisms are pursued. The first one relies on establishing the category of internal multicategories as an equalizer of categories of diagrams. The second approach extends the techniques developed by Ivan Le Creurer in his study of descent for internal essentially algebraic structures.</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-022-09706-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45853869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trace Decategorification of Categorified Quantum sl(3)","authors":"Marko Živković","doi":"10.1007/s10485-022-09704-x","DOIUrl":"10.1007/s10485-022-09704-x","url":null,"abstract":"<div><p>We prove that the trace of categorified quantum <span>(mathfrak {sl}_3)</span> introduced by Khovanov and Lauda can also be identified with quantum <span>(mathfrak {sl}_3)</span>, thus providing an alternative way of decategorification. This is the second step of trace decategorification of quantum <span>(mathfrak {sl}_n)</span> groups over the integers, the first being the <span>(mathfrak {sl}_2)</span> case. The main technique used is decoupling of categorified quantum group into its positive and negative part. This technique can be used for more general categorified quantum groups to reduce the problem to the trace decategorification of its positive part. In the case of quantum <span>(mathfrak {sl}_3)</span>, there is an explicit form of the canonical basis of the positive (and isomorphically negative) part of it based on indecomposables found by Stošić, leading to the full result in this case.</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50019537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A symmetric approach to higher coverings in categorical Galois theory","authors":"Fara Renaud, Tim Van der Linden","doi":"10.1007/s10485-022-09698-6","DOIUrl":"10.1007/s10485-022-09698-6","url":null,"abstract":"<div><p>In the context of a tower of (strongly Birkhoff) Galois structures in the sense of categorical Galois theory, we show that the concept of a higher covering admits a characterisation which is at the same time <i>absolute</i> (with respect to the base level in the tower), rather than inductively defined relative to extensions of a lower order; and <i>symmetric</i>, rather than depending on a perspective in terms of arrows pointing in a certain chosen direction. This result applies to the Galois theory of quandles, for instance, where it helps us characterising the higher coverings in purely algebraic terms.\u0000</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-022-09698-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42697676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Local Cohen–Macaulay DG-Modules","authors":"Xiaoyan Yang, Yanjie Li","doi":"10.1007/s10485-022-09703-y","DOIUrl":"10.1007/s10485-022-09703-y","url":null,"abstract":"<div><p>Let <i>A</i> be a commutative noetherian local DG-ring with bounded cohomology. For local Cohen–Macaulay DG-modules with constant amplitude, we obtain an explicit formula for the sequential depth, show that Cohen–Macaulayness is stable under localization and give several equivalent definitions of maximal local Cohen–Macaulay DG-modules over local Cohen–Macaulay DG-rings. We also provide some characterizations of Gorenstein DG-rings by projective and injective dimensions of DG-modules.\u0000</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-022-09703-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46569515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Minimal Models of Some Differential Graded Modules","authors":"Berrin Şentürk, Özgün Ünlü","doi":"10.1007/s10485-022-09708-7","DOIUrl":"10.1007/s10485-022-09708-7","url":null,"abstract":"<div><p>Minimal models of chain complexes associated with free torus actions on spaces have been extensively studied in the literature. In this paper, we discuss these constructions using the language of operads. The main goal of this paper is to define a new Koszul operad that has projections onto several of the operads used in these minimal model constructions.</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50006606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alejandro Alvarado García, César Cejudo Castilla, Mauricio Medina Bárcenas, Ivan Fernando Vilchis Montalvo
{"title":"Operators Between Classes of Modules Given by Preradicals","authors":"Alejandro Alvarado García, César Cejudo Castilla, Mauricio Medina Bárcenas, Ivan Fernando Vilchis Montalvo","doi":"10.1007/s10485-022-09702-z","DOIUrl":"10.1007/s10485-022-09702-z","url":null,"abstract":"","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":"1"},"PeriodicalIF":0.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10485-022-09702-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50037081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ramsey Properties of Products and Pullbacks of Categories and the Grothendieck Construction","authors":"Dragan Mašulović","doi":"10.1007/s10485-022-09700-1","DOIUrl":"10.1007/s10485-022-09700-1","url":null,"abstract":"<div><p>In this paper we provide purely categorical proofs of two important results of structural Ramsey theory: the result of M. Sokić that the free product of Ramsey classes is a Ramsey class, and the result of M. Bodirsky, M. Pinsker and T. Tsankov that adding constants to the language of a Ramsey class preserves the Ramsey property. The proofs that we present here ignore the model-theoretic background of these statements. Instead, they focus on categorical constructions by which the classes can be constructed generalizing the original statements along the way. It turns out that the restriction to classes of relational structures, although fundamental for the original proof strategies, is not relevant for the statements themselves. The categorical proofs we present here remove all restrictions on the signature of first-order structures and provide the information not only about the Ramsey property but also about the Ramsey degrees.</p></div>","PeriodicalId":7952,"journal":{"name":"Applied Categorical Structures","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45814455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}