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Eistute -- singular algebraic surface

by ofloveandhate

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algebraic geometry algebraic surface bertini bertini real decomposed herwig hauser math math art non-manifold ofloveandhate singular surface unbounded

Eistute, a singular algebraic surface of degree six. This is the set of real points for which
```
(x^2+y^2)^3-4*x^2*y^2*(z^2+1) = 0.
```

Has a singular line -- the z-axis! When you compute points on it, you get them 16 times!

I have provided these files:
* `Eistute_thickened_Smooth_repaired.stl` -- has the normal vectors fixed, and is thickened for printing.
* `eistute_raw_correct.stl` -- raw triangulation coming from Bertini_real. Since the program works in arbitrary dimensions,

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