Up until now, I have been using lists instead of sets in solve() in order to ensure the first equation is solved for the first variable, the second for the second, etc.  However, I have run into a case for which using an equation list and a variable list does not work, but the equation list alone is fine, and sets of both are fine, etc.  I would be grateful if somebody can explain why the first statement below does not produce a solution.

> soln := solve([foc1 = 0, foc2 = 0, foc3 = 0...

CTmodel-1.mw

Can anybody spot the problem in the second solve() in the attached file?  I am using the same approach that I did for the first solve(), but Maple is returning any empty list. 

Thanks!

I am just learning Maple, but have plotted several parametric curves.  However, the attached code is giving me an error message that seems to be saying that my indices for the two elements of the curve vector are out of range.  I don't see why.  Can you explain?

Here's the file:  NewtonLeastResistanc.mw

Thanks for any help!