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Question: A problem with the commands "Infinitesimals" and "InvariantSolutions"

Question:A problem with the commands "Infinitesimals" and "InvariantSolutions"

luk 5 Maple 15
pdetools
April 03 2013
1

I have the following problem with the commands "Infinitesimals" and "InvariantSolutions". After using them to a system of firsst-order PDE's, the following message appears:

 

 Error, (in table["k"]) expected a request of prolongation w.r.t one of 2 independent variables; received a request w.r.t the (inexistent) 4th one

Does anybody know, what this message means ? I am a beginner with the commands "Infinitesimals" and "InvariantSolutions" and I do not know, what this message means.

 

Thank you in advance for the help.
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