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In 3D, we've assumed that the uncertainty around a point is described by an
ellipse (in the plane normal to the curve). Thus, we also use 3 points to describe
the ellipse (
for the nominal point, and 
and 
the two extreme
points along the two axis of the ellipse). The problem reduces to determining whether
one ellipse is inside another. We have developed an algebraic solution to
this problem (see section 3.2.3).