The sage.rings.polynomial.polynomial_ring_constructor package in Sage library is used for polynomial ring creation. The PolynomialRing method within this package is used to create polynomial rings with the required number of variables and coefficients from a given ring.
Here are some examples of using the PolynomialRing method with gens parameter:
Example 1:
PolynomialRing(QQ, 'x', 3)
This creates a polynomial ring in three variables x[0], x[1], x[2] with coefficients from the rational field QQ.
Example 2:
PolynomialRing(GF(2), 'x', 5, gens='a b c d e')
This creates a polynomial ring in five variables a, b, c, d, e with coefficients from the Galois field GF(2).
Example 3:
R. = PolynomialRing(QQ)
This assigns a polynomial ring in two variables x and y with coefficients from the rational field QQ to the variable R.
In all of the above examples, the gens parameter is used to specify the variable names. The PolynomialRing method creates a polynomial ring with the specified variables and coefficients.
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