21 citations · 54 across the 16 of their papers we have counts for
Showing 2026Show all
2 papers · 1 filter
math.PR2026
Drift and joint minimal displacement for groups acting on hyperbolic spaces
Koji Fujiwara, Ryokichi Tanaka
We obtain a uniform lower bound for the drift of random walks on hyperbolic spaces in terms of joint minimal displacement. Our main theorem applies to weakly acylindrical actions o…
math.GR2026
Small growth rates of free groups
Koji Fujiwara, Sang-hyun Kim, Ryokichi Tanaka
We introduce the notion of a Magnus marking for a finite generating set of a group and prove a certain expansion property. Using this property, we determine the second and third sm…