2 papers
math.RA2003
Simple regular skew group rings
Kathi Crow
Given a group G acting on a ring R, one can construct the skew group ring R*G. Skew group rings have been studied in depth, but necessary and sufficient conditions for the simplici…
math.CO2002
132-avoiding Two-stack Sortable Permutations, Fibonacci Numbers, and Pell Numbers
Eric S. Egge, Toufik Mansour
In 1990 West conjectured that there are two-stack sortable permutations on letters. This conjecture was proved analytically by Zeilberger in 1992. Late…