Solve for multiple variables calls Algsys. As it says
(clearly!) in the documentation, this only works for
It would be useful, I think, if we would give a warning
(or an error?) when a non-polynomial equation were
passed to algsys, e.g.
Warning: Solve/Algsys can only solve for multiple
variables when the equations are polynomial. The
equation sqrt(a^2+b^2)=0 is not polynomial.
This is a common beginner's error, I think, encouraged of
course by the fact that the command is called "solve" --
you'd think it could solve any simple equation....
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