On the holonomic equivalence of two curves
Given a principal [Formula: see text]-bundle [Formula: see text] and two [Formula: see text] curves in [Formula: see text] with coinciding endpoints, we say that the two curves are holonomically equivalent if the parallel transport along them is identical for any smooth connection on [Formula: see text]. The main result in this paper is that if [Formula: see text] is semi-simple, then the two curves are holonomically equivalent if and only if there is a thin, i.e. of rank at most one, [Formula: see text] homotopy linking them. Additionally, it is also demonstrated that this is equivalent to the factorizability through a tree of the loop formed from the two curves and to the reducibility of a certain transfinite word associated to this loop. The curves are not assumed to be regular.