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liepde.html <!DOCTYPE HTML PUBLIC "-//SQ//DTD HTML 2.0 + all extensions//EN" "hmpro3.dtd"> <HTML> <HEAD> <TITLE></TITLE></HEAD> <BODY> <TABLE BORDER="BORDER"> <TR> <TD>Author</TD> <TD>Thomas Wolf</TD></TR> <TR> <TD>Title</TD> <TD><font face="Courier New">LIEPDE</font></TD></TR> <TR> <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. </TD></TR> <TR> <TD>Platform</TD> <TD>REDUCE, version 3.6 or 3.7</TD></TR> <TR> <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. </TD></TR> <TR> <TD>Installation</TD> <TD>In a running REDUCE session either do <br> <font face="Courier New"> in "liepde.red"$ </font> <br> or, in order to speed up computation, either compile it with <br> <font face="Courier New"> on comp$ </font> <br> before the above command, or, generate a fast-loading compiled file once with <br> <font face="Courier New"> faslout "liepde"$ </font> <br> <font face="Courier New"> in "liepde.red"$ </font> <br> <font face="Courier New"> faslend$ </font> <br> and load that file whenever you want to run <font face="Courier New">LIEPDE</font> with <br> <font face="Courier New"> 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> <TR> <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> <TR> <TD>Contact</TD> <TD>e-mail: <a href="mailto:T.Wolf@maths.qmw.ac.uk"> Thomas Wolf</a></TD></TR></TABLE></BODY></HTML>