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math.CO2010★ 2 cited
What Could Be a Simple Permutation?
Rehana Ashraf, Barbu Berceanu, Ayesha Riasat
Different ways to describe a permutation, as a sequence of integers, or a product of Coxeter generators, or a tree, give different choices to define a simple permutation. We recoll…
math.CO2010★ 1 cited
Fibonacci numbers and positive braids
Rehana Ashraf, Barbu Berceanu, Ayesha Riasat
The paper contains enumerative combinatorics for positive braids, square free braids, and simple braids, emphasizing connections with classical Fibonacci sequence. The simple subgr…