Lattice-like translation ball packings in Nil space
Jenő Szirmai · Publicationes Mathematicae Debrecen · 2012
Nil geometry is one of the eight homogeneous Thurston 3-geometries:Nil, Sol.Nil can be derived from W. Heisenberg's famous real matrix group.The notion of translation curve and translation ball can be introduced by initiative of E. Molnár (see [MS], [MSz], [Sz10]).P. Scott in [S