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## Homework Statement

I need to obtain the equation of 2 paraboloids separated by a distance L.

## Homework Equations

I think that the equations should be:

z_1=x^2+y^2

z_2=x^2+y^2-L

## The Attempt at a Solution

The problem is that when I plot the region between two inequations,

x^2+y^2>=z and z+L>=x^2+y^2

the region is not of size L

Thanks[/B]