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I have a problem!

• To: mathgroup at smc.vnet.net
• Subject: [mg22980] I have a problem!
• From: giga99 at usa.net (Johanna Pirnes)
• Date: Sat, 8 Apr 2000 14:44:47 -0400 (EDT)
• Organization: The Math Forum
• Sender: owner-wri-mathgroup at wolfram.com

I can not figure out a solution to this problem.
What kind of surfaces presents this equation:

z=px^2/(a^2) + qy^2/(b^2)

when signs p and q gets values 1 and -1.

And how I can draw an example each of appearable type of surface. Is
it possible to draw an example with Mathematica?

I hope you understand my question, and I really hope, that someone
could answer to my question!! And the sooner the better...