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Newsgroups: sci.math
From: Mariano Suárez-Alvarez <mariano.suarezalva...@gmail.com>
Date: Sun, 18 May 2008 15:31:11 -0700 (PDT)
Local: Sun, May 18 2008 6:31 pm
Subject: Re: curves on quadrics
On May 18, 7:04 pm, Ken Pledger <ken.pled...@mcs.vuw.ac.nz> wrote:
> In article Why? > <f4b27853-16cf-45fb-8559-3df2021bf...@d1g2000hsg.googlegroups.com>, > Dmitry Sustretov <dmitry.sustre...@gmail.com> wrote: > > .... By the way, are hyperboloid and hyperbolic paraboloid (that > Your geometry here is presumably affine or Euclidean, not purely > The hyperboloid of one sheet and the hyperbolic paraboloid are the Mostly because when working over the complex numbers > only proper (non-degenerate) quadrics with real rulings, yes. Cones, > cylinders and plane-pairs also have real rulings, and if you allow > complex coordinates then even ellipsoids are ruled. there is no difference between an ellipsoid and an hyperboloid! ;-) -- m You must Sign in before you can post messages.
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