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Cone surface function??

  • To: mathgroup at
  • Subject: [mg8314] Cone surface function??
  • From: "Herve R. Cousin" <cousin at>
  • Date: Sun, 24 Aug 1997 13:24:30 -0400
  • Organization: Federal Institut of Technology (ETH-Z)
  • Sender: owner-wri-mathgroup at

Hi there,

I am trying to describe the surface of a cone, for a surface-function in

Solving (x/a)^2+(y/b)^2-(z/c)^2=0, with a=b, I get a cone pointing
"downwards", could somebody enlighten me how to "let it go" upwards
(point in +z-axis)?

I know it's basic stuff but somehow I get stuck ...



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