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MathGroup Archive 1992

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Two questions

  • To: mathgroup at
  • Subject: Two questions
  • From: KUMM at
  • Date: Thu, 6 Aug 1992 18:21:00 -0400 (EDT)

I have two Mathematica questions for the assembled multitudes.
     (1) I would like to take two quadric surfaces, e.g. two paraboloids
         8-(x^2)-(y^2),(x^2)+3(y^2), graph the two together AND Then
         graph the intersection on the xy plane "below" the two surfaces.
         In general, how do we get the surfaces to "cast a shadow".
     (2) Even if I calculate the intersection of the above myself,
         (x^2)+2(y^2)=4, how can I get Mma to graph this.  In general,
         how do we graph functions expressed implicitly?
                                        E.A.Kumm (kumm at

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