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questions about tensors,variable transformations


I'm a fairly new mathematica user, and I have a couple of questions that  
hopefully have simple answers.  

Second, is there a way to transform the dependent variable in a differential  
equation?  For example, I'm using a transformation xi=x, eta=y/f(x) that I'd  
like to apply.  This is easily done in macsyma, but I haven't figured out how  
to do it in mathematica, and it's a huge pain to go back and forth between the  
two.  Alternately, is there a package which will take mathematica output and  
move it into macsyma, and vice-versa?

Thanks in advance to anyone who can help,

			Dave

--
David M. Meyer                             Mechanical & Aerospace Engineering
dmm0t at virginia.edu                         University of Virginia
dmm0t at rincewind.mech.Virginia.EDU (NeXTmail)





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