Minimal generating sets of Reidemeister moves
Minimal generating sets of Reidemeister moves
复制标题
DOI:
10.4171/qt
复制
发表时间:
2009-08
期刊:
影响因子:
--
通讯作者:
M. Polyak
中科院分区:
文献类型:
--
作者:
M. Polyak
It is well known that any two diagrams representing the same oriented link are related by a finite sequence of Reidemeister moves O1, O2 and O3. Depending on orientations of fragments involved in the moves, one may distinguish 4 different versions of each of the O1 and O2 moves, and 8 versions of the O3 move. We introduce a minimal generating set of four oriented Reidemeister moves, which includes two O1 moves, one O2 move, and one O3 move. We then study which other sets of up to 5 oriented moves generate all moves, and show that only few of them do. Some commonly considered sets are shown not to be generating. An unexpected non-equivalence of different O3 moves is discussed.