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No changes within the code.

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+###############################################################################
+###############################################################################
+###
+### README (for dd_functions SAGE package)
+###
+###############################################################################
+###############################################################################
+
+dd_functions is a SAGE package free to get from the git repository
+http://git.risc.jku.at/gitweb/?p=ajpastor/diff_defined_functions.git/
+hosted by RISC (Research Intitute for Symbolic Computation).
+
+This package was developed in the research funded by the Austrian Science Fund 
+(FWF): W1214-N15, project DK15.
+
+###############################################################################
+
+In this repository several files can be found int root folder:
+
+    - Makefile: a Makefile used for easy distribution of this repository. We do 
+    NOT recommend to use it.
+    - SPKG.txt: general information file with the description of the project the
+    name and email address of the author, and the License under which this project
+    was developed.
+    - dependencies: a file for the installation of the package in other SAGE systems.
+    It contains no dependencies.
+    - package-version.txt: a file with the number of the current version distributed
+    in this repository.
+    - setup.py: the installation file for this package. WARNING: this file and
+    installation has not been tested.
+    - type: file containing the keyword for the type of SAGE pakage this is. Currently
+    it is "optional".
+    - README.txt: the present file.
+    
+These files are not intended to be currently used by the user of this package since
+the setup file has not been yet tested. Within this root folder, two main folders
+can be found:
+
+    - ajpastor: the main folder with the Python-compiled source code. This is the 
+    main folder the user should be concerned for. 
+    The user can add this file to the SAGE searching path (in the init.sage file
+    of their SAGE distribution), or run SAGE from the root folder of the repository.
+    
+    This would give direct access to the sode developed in this project with the 
+    following syntax:
+        sage: from ajpastor.dd_functions import *
+    If some particualr package want to be loaded, just use the usual python import
+    notation naming the package aftes the "ajpastor" initial folder.
+        EXAMPLE: sage: from ajpastor.operator.OreOperator import *;
+        
+    - releases: in this folder the current version and older releases for the coded 
+    are stored (in .zip format). This files are named in the following way:
+        diff_defined_functions__XX.zip
+    where "XX" is the number of the version of the project they contain.
+    Inside this folder another directory can be found. This zip files follows the 
+    same convention for naming as in the "releases" folder, but it add also the 
+    date and hour this version was commited to the repository.
+    
+###############################################################################
+    named "old". Inside this fodler one can find the same kind of .zip files
+    for all the intermidiate releases for the code.

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