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Finding the periphery of a region

• To: mathgroup at smc.vnet.net
• Subject: [mg71983] Finding the periphery of a region
• From: "Bonny Banerjee" <banerjee.28 at osu.edu>
• Date: Thu, 7 Dec 2006 06:25:26 -0500 (EST)
• Organization: Ohio State University

I have a region specified by a logical combination of equatlities and 
inequalities. For example, r(x,y) is a region defined as follows:

r(x,y) = x^2+y^2<100 or (5<=x<=25 and -10<=y<=10)

How do I obtain the periphery of r(x,y)? I am only interested in finite 
regions i.e. x or y never extends to infinity.

Thanks,
Bonny. 

• Follow-Ups:
  • Re: Finding the periphery of a region
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>