Transposition diameter on circular binary strings

Abstract: On the string of finite length, a (genomic) transposition is defined as the operation of exchanging two consecutive substrings. The minimum number of transpositions needed to transform one into the other is the transposition distance, that has been researched in recent years. In this paper, we study transposition distances on circular binary strings. A circular binary string is the string that consists of symbols $0$ and $1$ and regards its circular shifts as equivalent. The property of transpositions which partition strings is observed. A lower bound on the transposition distance is represented in terms of partitions. An upper bound on the transposition distance follows covering of the set of partitions. The transposition diameter is given with a necessary and sufficient condition.