2 papers
math.GR2013
Semigroup Conjectures for Central Semidirect Product of R^n with R^m
Kevin Lui, Viorel Nitica, Siddharth Venkatesh
In this paper we prove two new results about closed semigroups in the family of solvable groups H_{mn} that are semidirect products of R^m and R^n, and for which the structure homo…
cond-mat.mtrl-sci2003
An Investigation of Laboratory-Grown "Ice Spikes"
K. G. Libbrecht, K. Lui
We have investigated the formation of 10-50 mm long ``ice spikes'' that sometimes appear on the free surface of water when it solidifies. By freezing water under different conditio…