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>