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Newsgroups: sci.math
From: Ken Pledger <ken.pled...@mcs.vuw.ac.nz>
Date: Mon, 19 May 2008 13:11:28 +1200
Local: Sun, May 18 2008 9:11 pm
Subject: Re: curves on quadrics
In article
<92887ab2-0d8a-4296-8034-114c86aae...@56g2000hsm.googlegroups.com>, Mariano Suárez-Alvarez <mariano.suarezalva...@gmail.com> wrote: > On May 18, 7:04 pm, Ken Pledger <ken.pled...@mcs.vuw.ac.nz> wrote: In projective geometry there's only one kind of proper quadric. > > In article > > <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 > Why? .... To switch to affine geometry you choose an absolute (plane at infinity); then a hyperboloid meets that plane in a real proper conic and a hyperbolic paraboloid meets it in a real line-pair. Ken Pledger. You must Sign in before you can post messages.
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