by mert
Last Updated June 14, 2018 15:23 PM

I would like to reproduce the plot given in picture.
The function (with known `a`

and `c`

) is

```
a(x^2+y^2+z^2)+(1-a)(abs(x)+abs(y)+abs(z))=c where 0<a<1, c>0
```

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