Phone:: (023) 8059 5137
Email:: A.Martino@soton.ac.uk

Dr Armando Martino

Associate Professor

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Dr Armando Martino is Associate Professor within Mathematical Sciences at the University of Southampton.

BA Mathematics, University of Oxford
PhD in Mathematics, University of London, Queen Mary College
EPSRC Postdoc, Southampton
Temporary Lecturer, Cork
Postdoc, CRM, Barcelona
Ramon y Cajal Postdoc, UPC, Barcelona

Research

Responsibilities

Publications

Teaching

Contact

Research interests

Geometric group theory
Geometric Group Theory is the study of groups, that is the study of formal symmetry, in the context of their actions on suitably well behaved geometric objects. This incorporates such areas as the study of isometries of hyperbolic space, to the study of automorphisms of simplicial trees.
Automorphisms of free groups
One of the basic objects in geometric group theory is that of free groups, which are groups that have no relations. These arise in topology as the fundamental groups of non-closed surfaces as well as in many other situations, such as in most linear groups, thanks to the Tits Alternative. An area of current interest is the study of automorphisms of free groups which are part of a grand analogy with mapping class groups of surfaces and arithmetic groups. In particular, the study of these groups focusses on their action on a finite dimensional contractible space known as Culler Vogtmann space. My recent interest has been to explore the geometry of this space, via the study of the Lipschitz metric.
Group actions on trees
The classical theory of Bass-Serre gives detailed information on a group which has an action on a simplicial tree. More recently, there has been interest in the study of action on non-Archimedean trees, especially as this relates to equations in groups and the solution of the Tarski problem for free groups.
Residual finiteness properties of groups
One of the most natural ways to study an infinite group is to understand it via its finite quotients. Residual finiteness is a property that a group has if one can distinguish elements of the group simply by consideration of its finite quotients. Conjugacy separability, a related property of interest to me, is the analogue of residual finiteness for conjugacy classes.

Research group

Pure Mathematics

Research project(s)

Profinite topology on non-positively curved groups

Questionnaire Organiser

Articles

Antolin, Y., Martino, A., & Ventura, E. (2017). Degree of commutativity of infinite groups. Proceedings of the American Mathematical Society, 145, 479-485. DOI: 10.1090/proc/13231

Martino, A., & Francaviglia, S. (2017). Stretching factors, metrics and train tracks for free products. Illinois Journal of Mathematics, 59(4), 859-899.

Burillo, J., Cleary, S., Martino, A., & Rover, C. (2016). Commensurations and metric properties of Houghton's groups. Pacific Journal of Mathematics, 285(2), 289-301. DOI: 10.2140/pjm.2016.285.289

Kropholler, P., & Martino, A. (2016). Graph-wreath products and finiteness conditions. Journal of Pure and Applied Algebra, 220(1), 422-434. DOI: 10.1016/j.jpaa.2015.07.001

Antolin, Y., Burillo, J., & Martino, A. (2015). Conjugacy in Houghton's groups. Publicacions Matemàtiques, 59(1), 3-16.

Antolin, Y., Martino, A., & Schwabrow, I. (2014). Kurosh rank of intersections of subgroups of free products of right-orderable groups. Mathematical Research Letters, 21(4), 649-661. DOI: 10.4310/MRL.2014.v21.n4.a2

Bassino, F., Martino, A., Nicaud, C., Ventura, E., & Weil, P. (2013). Statistical properties of subgroups of free groups. Random Structures Algorithms, 42(3), 349-373. DOI: 10.1002/rsa.20407

Martino, A., & Minasyan, A. (2012). Conjugacy in normal subgroups of hyperbolic groups. Forum Mathematicum, 24(5), 889-909. DOI: 10.1515/FORM.2011.089

Carette, M., Francaviglia, S., Kapovich, I., & Martino, A. (2012). Spectral rigidity of automorphic orbits in free groups. Algebraic & Geometric Topology, 12(3), 1457-1486. DOI: 10.2140/agt.2012.12.1457

Bogopolski, O., Martino, A., & Ventura, E. (2009). Orbit decidability and the conjugacy problem for some extensions of groups. Transactions of the American Mathematical Society, 362(4), 2003-2036.

Martino, A., Brady, N., Ciobanu, L., & O Rourke, S. (2009). The equation x^py^q=z^r and groups that act freely on \Lambda-trees. Transactions of the American Mathematical Society, 361(1), 223-236. DOI: 10.1090/S0002-9947-08-04639-4

Francavigila, S., & Martino, A. (2009). The isometry group of outer space. Advances in Mathematics, 231(3-4), 1940-1973. DOI: 10.1016/j.aim.2012.07.011

Lecturer:
MATH3086, Galois Theory

Dr Armando Martino
Building 54, Room 7001, Mathematical Sciences, University of Southampton, Highfield, Southampton SO17 1BJ

Room Number:54/7001

Telephone:(023) 8059 5137
Facsimile:(023) 8059 5147
Email:A.Martino@soton.ac.uk

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