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Fucntional Derivatives and Variational Calculus


MathGroup,
	I am looking for papers, books, pakages or pointers regarding
implimentation of the varirational calculus within Mma.  For instance
I would like to be able to take the variational dervatives of complicated
integral equations:

		J[y]:=Integrate[F[x,y[x],y'[x], ... ],x]  ;

 		find del_J[y]/del_y 

	Thanks in advance,  Matt.





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