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SUMMARY:Variational principle for discrete 2d integrable systems - Lobb\, 
 S (University of Sydney)
DTSTART:20130710T090000Z
DTEND:20130710T093000Z
UID:TALK46157@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:For multidimensionally consistent systems we can consider the 
 Lagrangian as a form\, closed on the multidimensional equations of motion.
  For 2-d systems this allows us to define an action on a surface embedded 
 in higher dimensions. It is then natural to propose that the system should
  be derived from a variational principle which includes not only variation
 s with respect to the dependent variables\, but also variations of the sur
 face in the space of independent variables. I will describe how this puts 
 constraints on the Lagrangian\, and how this leads to equations on a singl
 e quad in the lattice.\n
LOCATION:Seminar Room 1\, Newton Institute
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