GaussianIntegers
 Usage
• GaussianIntegers is an option for FactorInteger, PrimeQ, Factor and related functions which specifies whether factorization should be done over Gaussian integers.
Notes
• With GaussianIntegers -> False, factorization is done over the ordinary ring of integers  . • With GaussianIntegers -> True, factorization is done over the ring of integers with  adjoined  . • Example: FactorInteger[13, GaussianIntegers -> True]  . • The Gaussian primes used when GaussianIntegers -> True are chosen to have both real and imaginary parts positive. • The first entry in the list given by FactorInteger with GaussianIntegers -> True may be -1 or -I. • New in Version 2.
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