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Macaulay2Doc :: coefficientRing

coefficientRing -- get the coefficient ring

Synopsis

Description

If R is a polynomial ring, then the coefficient ring is the base ring from which the coefficients are drawn. If R is constructed from a polynomial ring as a quotient ring or a fraction ring or a sequence of such operations, then the original coefficient ring is returned. 
i1 : coefficientRing(ZZ/101[a][b])

      ZZ
o1 = ---[a]
     101

o1 : PolynomialRing
 
i2 : ultimate(coefficientRing,ZZ/101[a][b])

      ZZ
o2 = ---
     101

o2 : QuotientRing

See also

Ways to use coefficientRing :

For the programmer

The object coefficientRing is a method function.