This figure shows a finite portion of a hyperboloid of two sheets. The hyperboloid of two sheets is a quadric surface,
i.e. a surface of degree 2 that does not contain an infinite family of lines.
In fact, there are non-ruled lines on this surface.
no |

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*I made the figure on this page by substituting my own data in a
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Prof. Joel Roberts

School of Mathematics

University of Minnesota

Minneapolis, MN 55455

USA

Office: 351 Vincent Hall

Phone: (612) 625-1076

Dept. FAX: (612) 626-2017

e-mail: `roberts@math.umn.edu
http://www.math.umn.edu/~roberts
`