In this paper we study the semigroup $I_\infty^\dnearrow(N)$ of partial co-finite almost monotone bijective transformations of the set of positive integers $\mathbb{N}$. We show that the semigroup $I_\infty^\dnearrow(N)$ has algebraic properties similar to the bicyclic semigroup: it is bisimple and all of its non-trivial group homomorphisms are either isomorphisms or group homomorphisms. Also we prove that every Baire topology $τ$ on $I_\infty^\dnearrow(N)$ such that $(I_\infty^\dnearrow(N),τ)$ is a semitopological semigroup is discrete, describe the closure of $(I_\infty^\dnearrow(N),τ)$ in a topological semigroup and construct non-discrete Hausdorff semigroup topologies on $I_\infty^\dnearrow(N)$.
On the semigroup of injective monoid endomorphisms of the monoid $\boldsymbol{B}_ω^{\mathscr{F}^3}$ with a three element family $\mathscr{F}^3$ of inductive nonempty subsets of $ω$
On the semigroup of injective monoid endomor\-phisms of the monoid $\boldsymbol{B}_ω^{\mathscr{F}}$ with the two-elements family $\mathscr{F}$ of inductive nonempty subsets of $ω$
On injective endomorphisms of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}^4}$ with a four-element family $\mathscr{F}^4$ of inductive non-empty subsets of $ω$
Ivan Franko National University of Lviv(伊万·弗兰科利沃夫国立大学)
On the semigroup of monoid endomorphisms of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}}$ with a two-element family $\mathscr{F}$ of inductive nonempty subsets of $ω$
本文研究了奇异Artin幺半群的一些组合性质。首先,我们证明了奇异Artin幺半群$SA$可以表示为图幺半群与其关联的Artin群$A$的半直积.这样的分解意味着一个奇异的阿廷幺半群嵌入一个群。其次,我们给出了FC型奇异Artin么半群的字问题的解决方案。然后证明了FC型奇异Artin么半群具有FRZ性质。简单地说,这个性质是说标准奇异生成元$τ_s$的任何非零幂的$SA$中的中心化子与相应的非奇异生成元$σ_s$的任何非零幂的中心化子重合。最后证明了Birman猜想,即对直角奇异Artin么半群,去奇异映射$η: SA \to \Z [A]$是内射的.
On injective endomorphisms of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}^3}$ with a three-element family $\mathscr{F}^3$ of inductive non-empty subsets of $ω$
Ivan Franko National University of Lviv(利沃夫伊万·弗兰科国立大学)
我们显示类似Muhlherr的[Coxeter群在Coxeter群,有限几何学和组合学,剑桥大学出版社(1993年),277-287]的阿廷-山雀幺半群,并为阿廷-山雀集团的球形类型。也就是说,submonoid(resp.一个Artin-Tits幺半群的子群(由Coxeter图的一个容许划分所导出的球面型群)是一个Artin-Tits幺半群(分别为组)。这推广和统一的情况下,submonoid(resp。子群)的固定元素的Artin-Tits幺半群(分别。球型群)在图自同构的作用下,以及由Crisp在[Injective maps between Artin groups,Geom.群论Down Under,Canberra(1996)119-137]中定义并由Godelle在[Morphismes injectifs entre groupes d 'Artin-Tits,Algebr.托波尔。2(2002),519- 536]。然后,我们完成分类的容许分区,其中涉及的Coxeter图没有无限标签,开始Muhlherr在[一些贡献的理论建筑物的基础上的门属性,论文,蒂宾根(1994年)]。这导致我们对Crisp的LCM-同态的分类。
Monoid generalizations of the Richard Thompson groups
Richard Thompson和Graham Higman的群G_{k,1}可以自然地推广到幺半群,我们称之为M_{k,1},以及逆幺半群,称为Inv_{k,1} ;这可以通过简单地将双射推广到部分函数或部分内射函数来完成。幺半群M_{k,1}与电路复杂性有关(在另一篇论文中研究)。本文证明了M_{k,1}和Inv_{k,1}对所有k都是同余单的.它们的格林关系J和D被刻画为:M_{k,1}和Inv_{k,1}是J-0-单的,并且它们有k-1个非零的D-类.它们是Cuntz代数O_k的乘法部分的子幺半群。它们都是有限生成的,它们在任意有限生成集上的字问题都在P中,它们的字问题在某些无限生成集上是coNP-完全的.本版本的变化:第4节已被彻底修订,错误已被纠正;但是,第4节的主要结果没有变化。除了定理2.3的证明是不完整的外,第1、2和3节没有改变;完整的证明发表在参考文献[6]的附录中,这里也给出了。
On the semigroup of injective endomorphisms of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}_n}$ which is generated by the family $\mathscr{F}_n$ of initial finite intervals of $ω$
我们构造了一族Artin-Tits群之间的态射,它推广了J.Crisp在[Injective maps between Artin groups,Proceedings of the Special Year in Geometric群论,Berlin,(1999),119 - 138]中构造的态射.我们表明,他们的限制,积极的阿廷幺半群尊重正常形式,并为FC型的阿廷-蒂茨群,这些态射是内射。第二个结果的证明使用了Deligne复形和[G. Niblo和L. Reeves,The geometry of cube complex and the complex of their基本群,Topology 37(1998)621 - 633]和[J.A. Altobelli和R. Charney,A geometric Rational Form for Artin Groups of FC type,Geom.Dedicata,79(2000)277 - 289].简历:On palmitit une classe de morphismes entre groupes d'Artin-Tits qui generalise cele martite par J. Crisp dans [Injective maps between Artin groups,Proceedings …