C. Kofinas

activity

20092026

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math.GR2026

Presentations of Lower-Triangular Subgroups of $Aut (F_{n})$

C. E. Kofinas

Let $F_{n}$ be the free group of rank $n \geq 2$ with basis $x_{1}, \dots, x_{n}$ . For $1 \leq j < i \leq n$ , let $d_{i, j}$ and $e_{i, j}$ be the automorphisms of $F_{n}$ defined by $d_{i,j}(x_i)=…

math.GR2026

The Lower Central Series of Right Lower-Triangular Nielsen Automorphism Groups

C. E. Kofinas

Let $F_{n}$ be a free group of rank $n \geq 3$ , freely generated by $x_{1}, \dots, x_{n}$ . For $1 \leq j < i \leq n$ , let $d_{i, j}$ denote the Nielsen automorphism of $F_{n}$ defined by $d_{i,j}(…

math.RA2026

Tame Automorphisms of Free Nilpotent Lie Algebras of Countably Infinite Rank

C. E. Kofinas

Let $L_{\infty}$ be a free Lie algebra of countably infinite rank over a field of characteristic $0$ and let $L_{\infty, c}$ be the free nilpotent Lie algebra of countably infinite…

math.GR2026

Automorphisms of a Free Centre-by-Centre-by-Metabelian Group of Rank 3

C. E. Kofinas

Let $F_{3}$ be the free group of rank $3$ and let $G_{3} = F_{3} / [F_{3}^{''}, F_{3}, F_{3}]$ , that is, $G_{3}$ is a free centre-by-centre-by-metabelian group of rank $3$ .…

Presentations of Lower-Triangular Subgroups of Aut(Fn​)

The Lower Central Series of Right Lower-Triangular Nielsen Automorphism Groups

Tame Automorphisms of Free Nilpotent Lie Algebras of Countably Infinite Rank

Automorphisms of a Free Centre-by-Centre-by-Metabelian Group of Rank 3

Presentations of Lower-Triangular Subgroups of $Aut (F_{n})$