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3d plot's of function's domain


Dear MathGroup,

I would be very grateful if you could help me on this:

I got a function of three variables f(x,y,z). I want to get a 3d plot of the
region A in R^3 such that for any vector of values (x,y,z) in A the function
f is positive. I'm only able to solve this problem in a basic way: I fix one
of the three variables -let's say z=Z -and then I get the 3d plot of the
function f(x,y| z=Z), get the contour plot and define the region of
interest. I can do it for several values of Z, but i think it is not very
elegant.

There is a way to obtain directly the 3d plot of the variables space such 
that the condition of f(.) being positive is satisfied?

Many thanks

A D

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