To an oriented link in a solid torus we associate a trace graph in a thickened torus in such a way that links are isotopic if and only if their trace graphs can be related by moves of finitely many standard types. The key ingredient is a study of codimension 2 singularities of link diagrams. For closed braids with a fixed number of strands, trace graphs can be recognized up to equivalence excluding one type of moves in polynomial time with respect to the braid length.
@article{1265380428,
author = {FIEDLER, Thomas and KURLIN, Vitaliy},
title = {A 1-parameter approach to links in a solid torus},
journal = {J. Math. Soc. Japan},
volume = {62},
number = {1},
year = {2010},
pages = { 167-211},
language = {en},
url = {http://dml.mathdoc.fr/item/1265380428}
}
FIEDLER, Thomas; KURLIN, Vitaliy. A 1-parameter approach to links in a solid torus. J. Math. Soc. Japan, Tome 62 (2010) no. 1, pp. 167-211. http://gdmltest.u-ga.fr/item/1265380428/