Solved
"but it is solved by Mathcad":
Then show the Mathcad file that does it....
When I read the article, the authors state that Mathcad was used to calculate a couple of parameters; and it - could - be used to solve the set of ODE's.
Further, in both expressions of k.1 appears a value named C.Bs
This value is not explained in the document, it does not even appear in the list of symbols at the end.
Bottom line: The article is unclear (at least for a casual reader and not knowledgable on the subject) from a mathematical point of view.
What is clear, is that with a set of three differential equations it is not possible to solve 4 independent functions. (Note: the crux is in 'independent' here!) There may be a relation between the 4 functions that the article is solving, but they are not clearly explaining it.
The very same argument holds for your set of 5 differential equations and trying to find 6 functions....
Luc
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