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math-ph2013
An extension of the Dirac theory of constraints
Larry Bates, Jedrzej Sniatycki
Constructions introduced by Dirac for singular Lagrangians are extended and reinterpreted to cover cases when kernel distributions are either nonintegrable or of nonconstant rank,…
math.DG2013
Polite actions of non-compact Lie groups
Larry Bates, Jedrzej Sniatycki
Based mainly on examples of interest in mechanics, we define the notion of a polite group action. One may view this as not only trying to give a more general notion than properness…