activity
19962026
most citedOn the finite presentation of subdirect products and the nature of residually free groups

66 citations · 383 across the 79 of their papers we have counts for

collaborators

92 papers

math.GR2026

Conjugator length in finitely presented groups

Martin R. Bridson, Timothy R. Riley, Andrew W. Sale

The conjugator length function of a finitely generated group gives the minimal upper bound on the length of a conjugator for a pair of words that represent conjugate elements i…

math.GR2025

Snowflake groups and conjugator length functions with non-integer exponents

Martin R. Bridson, Timothy R. Riley

We exhibit novel geometric phenomena in the study of conjugacy problems for discrete groups. We prove that the snowflake groups , indexed by pairs of positive integers $p>q…

math.GR2025

Groups with fast-growing conjugator length functions

Martin R. Bridson, Timothy R. Riley

We construct the first examples of finitely presented groups whose conjugator length function is exponential; these are central extensions of groups of the form . F…

math.GR2025

Relatively hyperbolic groups, Grothendieck pairs, and uncountable profinite ambiguity among fibre products

Martin R. Bridson, Alan W. Reid

These notes expand upon our lectures on {\em profinite rigidity} at the international colloquium on randomness, geometry and dynamics, organised by TIFR Mumbai at IISER Pune in Jan…

math.GR2025

Conjugacy in fibre products, distortion, and the geometry of cyclic subgroups

Martin R Bridson

We investigate the complexity of the conjugacy problem for fibre products in torsion-free hyperbolic groups. Let be a torsion-free hyperbolic group and let be the…

math.GR2025

On the conjugacy problem for subdirect products of hyperbolic groups

Martin R. Bridson

If and are torsion-free hyperbolic groups and is a finitely generated subdirect product, then the conjugacy problem in is solvable if and only if…