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Calyx - singular algebraic surface

by ofloveandhate

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algebraic geometry algebraic surface bertini bertini real herwig hauser infinitely thin math math art non-manifold non-smooth ofloveandhate point singularity surface unbounded

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

Has a point singularity on a cusp-line singularity.

I have provided these files:
* `Calyx_blocky_xy.stl` -- has the normal vectors fixed, and is thickened for printing.
* `calyx_medium_smooth_xy.stl` -- the blocky version, ran through the `sampler` module for `bertini_real`.
* `calyx_raw_blocky.stl` -- raw triangulation coming from Bertini_real. Since the p

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