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06/14/2023
Combinatorial generation via permutation languages. VI. Binary trees
In this paper we propose a notion of pattern avoidance in binary trees t...
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05/17/2022
The Hamilton compression of highly symmetric graphs
We say that a Hamilton cycle C=(x_1,…,x_n) in a graph G is k-symmetric, ...
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08/17/2021
Star transposition Gray codes for multiset permutations
Given integers k≥ 2 and a_1,…,a_k≥ 1, let a:=(a_1,…,a_k) and n:=a_1+⋯+a_...
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12/03/2019
On the central levels problem
The central levels problem asserts that the subgraph of the (2m+1)-dimen...
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02/16/2018
Gray codes and symmetric chains
We consider the problem of constructing a cyclic listing of all bitstrin...
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10/23/2017