Using the connection between closed solution curves of the vortex filament
equation and the periodic problem for the nonlinear Schrodinger equation (N
LS), we investigate the possibility of relating the knot types of finite-ga
p solution to the Floquet spectra of the corresponding NLS potentials, in t
he special case of small amplitude curves close to multiply-covered circles
. (C) 2001 IMACS. Published by Elsevier Science B.V. All rights reserved.