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System of polynomial inequalities

asked 12 years ago

anonymous user

Anonymous

I heard that something called a Groebner Basis can be used to find the solutions of a system of polynomial equations like p1(x1,,xm)=0,,pn(x1,,xm)=0

Is there something analgous that can find solutions when inequalities are also involved such as

p1(x1,,xm)=0,,pn(x1,,xm)=0 q1(x1,,xm)>0,,qr(x1,,xm)>0

and is there a way to do this in Sage?

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answered 12 years ago

You can use the cylindirical algebraic decomposition (CAD) method to solve a system of polynomials with inequalities. Sage has an optional package for QEPCAD. See the output of

sage: qepcad?

and try

./sage -i qepcad

from the command line to install QEPCAD. Note that the version we have (1.50) is quite old. The latest version on the web site is 1.69.

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Asked: 12 years ago

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Last updated: Dec 03 '12