Lecce, 28 January 2012

This folder contains new software for the CDIFF package, written by Raffaele
Vitolo. It is devoted to computations for general differential equations (i.e.,
not necessarily in evolution form) with an arbitrary number of independent
variables. It can compute symmetries, conservation laws, Hamiltonian,
symplectic and recursion operators, in local and nonlocal coordinates. It is
distributed under the same free license of REDUCE.

This folder contains:

A README.txt file;
 - The program file cde.red, for computations of differential consequences 
of even and odd partial differential equations and of the related total
derivatives.
 - The program file cdj.red, for computations with total derivatives on jet
spaces.
 - The file Cdiff-userguide-2.pdf, a CDIFF user guide for computations of
 symmetries, conservation laws, Hamiltonian, symplectic and recursion
 operators, in local and nonlocal coordinates.
 - The file global.txt with a list of global variables used in cdi.red.
 - The folder examples, which contains all examples described in the user guide
 with results and debug files.

Note that the userguide and the file global.txt are slightly outdated.
There are a few (not essential) commands in the example files in order
to make input-output operations clear. Moreover, in the folder examples
a new shell script (it works only in bash, a unix/linux shell) that runs reduce
on all examples has been inserted. The documentation will be updated as soon as
possible.

The authors welcomes comments and questions on CDIFF. 
