GF -- make a finite field

Ways to use GF :

GF Ring -- make a finite field from a ring

GF ZZ -- make a finite field of a given order

GF(ZZ,ZZ) -- make a finite field of a given prime power order

Optional arguments :

GF(..., PrimitiveElement) -- specify a primitive element

GF(..., Variable) -- specify a name for the generator of a Galois field