A. Takano

collaborators

2 papers

math.GR2026

Presentations of the cactus Thompson group

Yuya Kodama, Akihiro Takano

We give infinite and finite presentations of the cactus Thompson group. This group was introduced as $V_{mock}$ by Witzel and Zaremsky, who combined Thompson's group with…

math.GT2025

The Lodha--Moore groups and their $n$ -adic generalizations are not SCY

Yuya Kodama, Akihiro Takano

A closed 4-manifold is symplectic Calabi--Yau (SCY) if its canonical class is trivial. Friedl and Vidussi proved that Thompson's group $F$ cannot be the fundamental group of any SC…

Presentations of the cactus Thompson group

The Lodha--Moore groups and their n-adic generalizations are not SCY

The Lodha--Moore groups and their $n$ -adic generalizations are not SCY