Wonyong Jang

collaborators

3 papers

math.GR2026

Co-Hopfianity is not a profinite property

Hyungryul Baik, Wonyong Jang

We exhibit two finitely generated residually finite groups $G$ and $H$ with isomorphic profinite completions $G ≅ H$ , such that $G$ is co-Hopfian while $H$ …

math.GR2026

On non-freeness of groups generated by two parabolic matrices with rational parameters: limit points and the orbit test

Wonyong Jang, Dongryung Yi

For $I^\pm \in R$ , let $G_{I^} \pm := ⟨ [1011], [1 I^\pm 01] ⟩ < SL_{2} (R) .$ K. K…

math.GR2026

Bi-orderability and generalized torsion elements from the perspective of profinite properties

Wonyong Jang, Junseok Kim

Using fiber products, we construct bi-orderable groups from left-orderable groups. As an application, we show that bi-orderability is not a profinite property, answering a question…