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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.math
Subject: Re: Question came up at a party
Message-ID: <4864@alice.UUCP>
Date: Thu, 23-Jan-86 12:53:48 EST
Article-I.D.: alice.4864
Posted: Thu Jan 23 12:53:48 1986
Date-Received: Fri, 24-Jan-86 09:01:12 EST
References: <532@well.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 7

>	Is there a formula which describes *all* conic sections, which
> will generate a particular class of same (e.g., circles, hyperbolas)
> when certain coefficients are plugged into it?

I seem to recall something like

	Ax^2 + By^2 + Cxy + Dx + Ey + F = 0