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The groups (2, m vertical bar n, k vertical bar 1, q): Finiteness and homotopy

机译:组(2,M垂直条N,K垂直条1,Q):有限性和同型

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摘要

We initiate the study of the groups (l, m, vertical bar n, k vertical bar p, q) defined by the presentation < a; b vertical bar a(l) , b(m) ,(ab)(n) , (a(p)b(q))(k)>. When p = 1 and q = m - 1, we obtain the group (l, m, vertical bar n, k) , first systematically studied by Coxeter in 1939. In this paper, we restrict ourselves to the case l = 2 and <= 1/2 and give a complete determination as to which of the resulting groups are finite. We also, under certain broadly defined conditions, calculate generating sets for the second homotopy group pi(2)(Z), where Z is the space formed by attaching 2-cells corresponding to (ab)(n) and (ab(q))(k) to the wedge sum of the Eilenberg-MacLane spaces X and Y, where pi(1)(X) congruent to C-2 and pi(1)(Y) congruent to C-m; in particular, pi(1)(Z) congruent to (2, m vertical bar n, k vertical bar l, q).
机译:我们开始研究演示文稿。当p=1和q=m-1时,我们得到了群(l,m,垂直条n,k),这是Coxeter在1939年首次系统研究的。在本文中,我们将自己限制在l=2和<=1/2的情况下,并给出了所得到的群中哪些是有限的一个完整的判定。在某些广义条件下,我们还计算了第二同伦群pi(2)(Z)的生成集,其中Z是将对应于(ab)(n)和(ab(q))(k)的2个单元连接到Eilenberg-MacLane空间X和Y的楔形和上而形成的空间,其中pi(1)(X)与C-2全等,pi(1)(Y)与C-m全等;特别地,pi(1)(Z)与(2,m垂直条n,k垂直条l,q)全等。

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  • 来源
    《Journal of group theory》 |2021年第3期|共29页
  • 作者单位

    Univ Nottingham Sch Math Sci Univ Pk Nottingham NG7 2RD England;

    Univ Nottingham Sch Math Sci Univ Pk Nottingham NG7 2RD England;

    Univ Nottingham Sch Math Sci Univ Pk Nottingham NG7 2RD England;

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