Department of Mathematics Tennessee Technological University

Released: November 18, 1998
Last Revised: June 22, 2008

CLIFFORD - A Maple 11 Package for Clifford Algebra Computations
Version 11, December 20, 2007
with Bigebra, Cliplus, Define, code_support, GfG, GTP, Octonion, RJgrobner, SchurFkt. and SP

Rafal Ablamowicz (*) and Bertfried Fauser (**)

(*) Department of Mathematics, Box 5054
Tennessee Technological University, Cookeville, TN 38505
phone: USA (931) 372-3569, fax: USA (931) 372-6353
 rablamowicz@tntech.edu

Version 11 of CLIFFORD for Clifford algebra computations in Maple 11 is distributed as library_M11.zip that contains the following packages:

• CLIFFORD - for computations in Clifford algebras Cl(V,B) where dim V <=9, and B is an arbitrary bilinear form in V
• Bigebra - for computations with Hopf gebras and bi-gebras
• Cliplus - extends CLIFFORD to other bases such as the Clifford basis or the dotted wedge basis
• Define - fixes Maple's 'define'
• GfG - experimental package for Groebner bases in Grassmann algebras
  
• GTP - extends CLIFFORD to graded tensor products of Clifford algebras
• Octonion - for computations with octonions and octonionic matrices
• RJgrobner - a small package (with Jane Liu) for commutative Groebner bases. It does not need CLIFFORD/Bigebra.
• SchurFkt - package for the Hopf Algebra of Symmetric Function
• SINGULARPLURALlink - package to interface Maple 11 with Singular:Plural to compute Groebner bases in polynomial rings, and Grassmann and Clifford algebras
  
• SP - a  small package for symmetric functions. It does not need CLIFFORD/Bigebra.
• code_support - package to modify, copy, and insert help worksheets into Maple database. It does not need CLIFFORD/Bigebra.

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DISCLAIMER: THERE IS NO WARRANTY FOR THE CLIFFORD, Bigebra, Cliplus, Define, GfG, GTP, Octonion, RJGrobner, SchurFkt, SINGULARPLURALlink, SP, code_support PACKAGES TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
===============

You can find out how I use CLIFFORD by going to my recent publications page.

HIGHLIGHTS OF NEW FEATURES IN VERSION 11:

• This is an updated version of CLIFFORD ver. 8 from Maple 10 and made for Maple 11.
• There are no additional procedures in this version.
• To install all needed libraries, download libraries.
• To see all features, open help pages in Maple 11 (see below how) that are already included in the library files, or download documentation in .pdf format for printing and/or viewing in Adobe Reader.
• To see the Maple code of each module, download codes.
• To view installation instructions, go to section on installation under Windows, Linux, or download README.txt.
• To see how to test your installation go to section on testing installation.
• Total of 278 help worksheets converted to 40 MB of pdf help files taking up 1,129 pages of documentation. Clifford alone has about 4,500 lines of code.
  

INSTALLATION INSTRUCTIONS:

A. For Windows:

• Make sure you run Maple 11.
• Create a directory C:\Maple11\Cliffordlib.
  
• Download library_M11.zip to the directory C:\Maple11\Cliffordlib and unzip it there. It contains four files: maple.hdb, maple.lib, maple.ini, and maple.ind.
• Copy maple.ini to \LIB subdirectory of your Maple main directory (for example, by default Maple installs in C:\Program Files\Maple 11).
• If you want to install CLIFFORD and its supplementary packages in a directory other than C:\Maple11\Cliffordlib, you may do so but you will need to modify accordingly maple.ini. Make sure you type the path correctly and appropriately for your operating system.
• Test that installation has been done correctly (see below)

B. For Linux (if you have access to the root directory):

• 1. Download library_M11.zip (just right click on the link and then save to your system).
• 2. Change to root:

> su

• 3. Create a library directory in the maple path: Maple may be installed in /usr/local/maple called $MAPLE_PATH in the following

> mkdir $MAPLE_PATH/Cliffordlib

• 4. Copy the zip-file into this dir and unzip:

> cp library_M11.zip $MAPLE_PATH/Cliffordlib
> cd $MAPLE_PATH/Cliffordlib
> unzip library_M11.zip
Then proceed with 5a) if you have only maple8 running and with 5b) if you  have several maple versions running

• 5a. Change the .mapleinit file to accept the library as *first* entry in 'libname':

> exit              (* close root shell *)
> cd                (* go to home dir *)
> pico .mapleinit   (* pico / or vi editors *)
Add the line:
libname:=`$MAPLE_PATH`,libname;
and store the file (create it if necessary) as .mapleinit.

The initialization is finished. If you have any problems with installation under Linux, please contact Dr. Bertfried Fauser at:

         ==5b==>

• 5b. Stay being root!

> cd ../bin

open the file maple, and look for the place where xmaple11 is called change this line to (no white space after \ or type a single line only)
> exec ${MAPLE}/$MAPLE_SYS_BIN/xmaple11 -km p -b ${MAPLE}/Cliffordlib \ -b ${MAPLE}/lib $INCLUDES $PARAM
and change the line where mapleTTY is loaded to
>  exec ${MAPLE}/$MAPLE_SYS_BIN/mapleTTY -b ${MAPLE}/Cliffordlib \ -b ${MAPLE}/lib $INCLUDES $PARAM

(The option -b makes maple aware of locations of libraries. In this way you might want ot change every start script of several maple versions to find their own local libraries)
> exit
leave root shell.

C. For Linux (if you do not have root access):

• 1. Download library_M11.zip (just right click on the link and then save to your system).
• 2. Create a library directory in your home directory (* if you choose  a name starting with a dot, this dir is not displayed by default *)

> cd           (* go to home dir *)
> mkdir .Cliffordlib

• 3. Copy the zip-file into this dir and unzip:

> cp library_M11.zip ./.Cliffordlib
> cd .Cliffordlib
> unzip library_M11.zip

• 4. Change the .mapleinit file to accept the library as *first* entry in the variable 'libname'

> cd                  (* go to home dir *)
> pico .mapleinit     (* pico / or vi editors *)

• 5. Ad the line:

libname:=`<homedirectory>/.Cliffordlib',libname;
and store the file (create it if necessary) as .mapleinit.

• 6. The initialization is finished.
• 7. Unfortunately there is only one .mapleinit file for every maple version. This means that other versions of maple will use this directory too,

which might cause PROBLEMS. Currently there is no workaround for this and we recommend to insert the line
libname:=`<homedirectory>/.Cliffordlib',libname;
in the first line of any worksheet which use Clifford/Bigebra for Maple 11
Such a maple file looks like:
> restart: libname:=`<homedirectory>/.Cliffordlib',libname;
> with(Clifford):with(Bigebra): ## optional:  with(Cliplus):with(Octonion):with(GTP):
In this case no library path is needed. If you run several versions of  maple you might contact your local administrator 'root' to change the startup scripts as described above.

• Start Maple 11.
• To load the main module, at the Maple prompt, type:

>with(Clifford);

When the package is loaded, you should see a list with names of available procedures. If the package has not loaded and you get an error message make sure that files maple.hdb, maple.lib, and maple.ind extracted from library_M11.zip are all located in the directory such as C:\Maple11\Cliffordlib and that the path to that directory is included in maple.ini file. To see if maple.ini has been executed, type
>libname;
and Maple should respond with

            "C:\\Maple11/Cliffordlib", "C:\\Maple11/lib"

if maple.ini had this line:

libname:="C:\\Maple11/Cliffordlib",libname:
 

• To load other packages, issue with(packagename); command as well, where 'packagename' is one of Bigebra, Cliplus, GTP, Octonion, or code_support, etc...
• To check if help pages are available in the browser, at the Maple prompt type:

>?Clifford
You should then see the introductory page for CLIFFORD and at the top of the screen you should see Maple browser opening four vertical windows with words Clifford and intro highlighted in the two rightmost panels. You should also see, above and below Clifford, names of other packages for which help should now be available.
• To navigate through the help pages, begin with the introductory help page for CLIFFORD as described above and follow links within. You can also issue this command at the Maple prompt:

>?Clifford,intro

Most recent papers with CLIFFORD, Bigebra, etc.
 

• "Mathematics of CLIFFORD - a Maple package for Clifford and Grassmann algebras", Rafal Ablamowicz, Department of Mathematics at TTU, and Bertfried

Fauser, Universitat Konstanz, Germany, Tech. Report No. 2002-4, December 2002, http://www.math.tntech.edu/techreports/TR_2002_4.pdf
 
• "Clifford and Grassmann Hopf algebras via the bigebra package for Maple(R)", Rafal Ablamowicz, Department of Mathematics at TTU, and Bertfried Fauser,

Universitat Konstanz, Germany, Tech. Report No. 2002-5, December 2002, http://www.math.tntech.edu/techreports/TR_2002_5.pdf

RECENT BOOKS ON CLIFFORD ALGEBRAS:

"Clifford Algebras - Applications to Mathematics, Physics, and Engineering", Progress in Mathematical Physics, Volume 34, Rafa\l Ab\lamowicz, ed., Birkhauser, Boston 2004, ISBN 0-8176-3525-4
To order	More information




"Lectures on Clifford (Geometric) Algebras and Applications", Rafa\l Ab\lamowicz and Garret Sobczyk, editors, Birkhauser, Boston 2004, ISBN 0-8176-3257-3
To order	More information




``Clifford Algebras and their Applications in Mathematical Physics - Vol. 1 Algebra and Physics, Vol. 2 Clifford Analysis'', Rafa\l Ab\lamowicz and Bertfried Fauser (Vol. 1),  editors; and John Ryan and Wolfgang Sproessig (Vol. 2), editors, Birkhauser Boston 2000, ISBN 0-8176-4182-3 (Vol. 1), 0-8176-4183-1 (Vol. 2)
To order vol. 1                                  To order vol. 2	More information




``Clifford Algebras with Numeric and Symbolic Computations'', Rafa\l Ab\lamowicz, Pertti Lounesto, Josep M. Parra, editors, Birkhauser, Boston, 1996, ISBN 0-8176-3907-1
To order




``Clifford Algebras and Spinor Structures -- A Special Volume Dedicated to the Memory of Albert Crumeyrolle (1919 -- 1992)'', Rafa\l Ab\lamowicz and Pertti Lounesto, editors, Kluwer, Dordrecht, 1995, ISBN 0-7923-3366-7
To order

Please direct all questions, comments, and bug reports to:

Rafal Ablamowicz rablamowicz@tntech.edu
Department of Mathematics, Box 5054
Tennessee Technological University
Cookeville, TN 38505
phone: USA (931) 372-3569
fax: USA (931) 372-6353

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Last updated: June 22, 2008/ra