
 Geometric Mechanics, Lagrangian Reduction, and Nonholonomic Systems (Site not responding. Last check: 20071021) 
  This paper surveys selected recent progress in geometric mechanics, focussing on Lagrangian reduction and gives some new applications to nonholonomic systems, that is, mechanical systems with constraints typified by rolling without slipping. 
  The modern vision of mechanics includes, besides the traditional mechanics of particles and rigid bodies, field theories such as electromagnetism, fluid mechanics, plasma physics, solid mechanics as well as quantum mechanics, and relativistic theories, including gravity. 
  Symmetries in mechanics ranges from obvious translational and rotational symmetries to less obvious particle relabeling symmetries in fluids and plasmas, to subtle symmetries underlying integrable systems. 
 www.cds.caltech.edu /~marsden/bib/2001/01CeMaRa2001a (291 words) 
