2024/02/15 by William W. Menasco, Menasco, William W., Deepisha Solanki +1
Computer Science · #57K10 (Primary) 20F36 #57K30 (Secondary) #Digital Communication and Language #FOS: Mathematics #Geometric Topology (math.GT)
paper · pdf · doi:10.48550/arxiv.2402.09669
openalex publication_date 2024/02/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Our main results concern changing an arbitrary plat presentation of a split or composite link to one which is obviously recognizable as being split or composite. Pocket moves, first described in \citeunlinkviaplats, are utilized -- a pocket move alters a plat presentation without changing its link type, its bridge index or the double coset. A plat presentation of a split link is split if the planar projection of the plat presentation is not connected. We prove that pocket moves are the only obstruction to representing split links by split plat presentations. Since any pocket move corresponds to a sequence of double coset moves, we have the corollary that the double coset of every plat presentation of a split link has a split plat presentation. We obtain an analogous result for composite links by utilizing flip moves, which were also first described in the second author's work, arXiv:2308.00732 [math.GT].