liepde.html

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<TD>Author</TD>
<TD>Thomas Wolf</TD></TR>
<TR>
<TD>Title</TD>
<TD><font face="Courier New">LIEPDE</font></TD></TR>
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<TD>Short description</TD>
<TD>
The package <font face="Courier New">LIEPDE</font> computes
infinitesimal symmetries of differential equations (DEs).
These can be point-, contact and generalized higher order
symmetries. The overdetermined system of symmetry
conditions is solved by the program <a href="crack.html">
<font face="Courier New">CRACK</font></a>.
Flags allow the formulation and solution of the symmetry conditions in
successive stages to lower the overall memory and time requirements.
A parameter allows the computation of the prolongation of the
symmetry vector up to some given order.
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<TD>Platform</TD>
<TD>REDUCE, version 3.6 or 3.7</TD></TR>
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<TD>System requirements</TD>
<TD>The memory requirements depend crucially on the
application. The non-trivial computations in the test file 
<a href="ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/liepde.tst">
<font face="Courier New">liepde.tst</font></a>
have been run in an 8MB session under LINUX. 
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<TD>Installation</TD>
<TD>In a running REDUCE session either do <br>
<font face="Courier New"> &nbsp; in "liepde.red"$ </font> <br>
or, in order to speed up computation, either compile it with <br>
<font face="Courier New"> &nbsp; on comp$ </font> <br>
before the above command, or, generate a fast-loading compiled file once with <br>
<font face="Courier New"> &nbsp; faslout "liepde"$ </font> <br>
<font face="Courier New"> &nbsp; in "liepde.red"$ </font> <br>
<font face="Courier New"> &nbsp; faslend$ </font> <br>
and load that file whenever you want to run 
<font face="Courier New">LIEPDE</font> with <br>
<font face="Courier New"> &nbsp; load liepde$ </font> <br>
In a similar way proceed with the file 
<font face="Courier New">crack.red</font>.
The above commands assume all files to be in the current directory. 
</TD></TR>
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<TD>More information/updates </TD>
<TD>There are available a 
<a href="ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/liepde.tex">manual</a>, a
<a href="ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/liepde.tst">test file</a> and a
<a href="ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/liepde.rlg">log file</a>. <br>
A web demo for <font face="Courier New">LIEPDE</font> may be available
later. The latest version is available from 
<a href="ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/">
ftp://ftp.maths.qmw.ac.uk/pub/tw/liepde/</a>. <br>
</TD></TR>
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<TD>Contact</TD>
<TD>e-mail: <a href="mailto:T.Wolf@maths.qmw.ac.uk">
Thomas Wolf</a></TD></TR></TABLE></BODY></HTML>

