7.2.1 ideal (plural)
For PLURAL ideals are left ideals.
Ideals are represented as lists of polynomials which are interpreted as
left generators of the ideal.
For the operations with two-sided ideals see
twostd.
Like polynomials, ideals can only be defined or accessed with respect to a basering.
Note: size counts only the non-zero generators of an ideal
whereas ncols counts all generators.
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