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Product Description
Pluecker's conoid, given by z=f(x,y) = 2*x*y/(x^2+y^2), or by the parameterization x(s,t)=s*cos(t), y(s,t)=s*sin(t), z(s,t)=sin(2*t).
The function f(x,y)= 2*x*y/(x^2+y^2) has the property that f does not have a limit as (x,y) approaches (0,0) but it does when restricted to any line Ax+By=0 through the origin.
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