Følner sequences in polycyclic groups.
Christophe Pittet (1995)
Revista Matemática Iberoamericana
Similarity:
The isoperimetric inequality |∂Ω| / |Ω| = constant / log |Ω| for finite subsets Ω in a finitely generated group Γ with exponential growth is optimal if Γ is polycyclic.