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How to set y always greater than or equal to x for a function?

• To: mathgroup at smc.vnet.net
• Subject: [mg46569] How to set y always greater than or equal to x for a function?
• From: Albert Franco <francoatnsuok at earthlink.net>
• Date: Mon, 23 Feb 2004 22:33:55 -0500 (EST)
• Organization: The Franco Family
• Reply-to: francoatnsuok at earthlink.net
• Sender: owner-wri-mathgroup at wolfram.com

I recently purchased Mathematica 5.0, and I am in the process of 
learning how to take advantage of it's many features.

This is an example of one line I would like to calculate in Mathematica:

Plot3D[Sqrt[y-x],{x,-100,100},{y,-100,100}];


How can I best edit this line to make y always greater than or equal to x during 
calculation so the program doesn't try to take the square root of a 
negative number?

Any help will be appreciated.

Albert Franco

• Follow-Ups:
  • Re: How to set y always greater than or equal to x for a function?
    • From: Oleksandr Pavlyk <pavlyk@phys.psu.edu>