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It is the site of the article
Игра в кубики
или
Кривая n-го порядка и m точек
Readers can see animations and download Mathcad-sheets in replies
PS
Sorry - it must be not a question but a blog. But now we have not blogs here!
One animation from Werner Exiger
Second animation from Werner Exinger
Now with SMath
https://en.smath.com/forum/yaf_postsm82876_Cubic-lines.aspx
