PolynomialGCD
 Usage
Notes
 Further Examples
This gives the greatest common divisor of a pair of polynomials.
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Here is the greatest common divisor of another pair.
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We can take the gcd of polynomials involving Gaussian rationals, and this can even be done modulo a real Gaussian prime.
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This pair of polynomials are taken to be over an extension of the rational numbers. PolynomialGCD cannot find a nontrivial gcd with the default setting of None for the option Extension.
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PolynomialGCD finds a nontrivial gcd when the option Extension is set to Automatic.
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