Singular Manual: ideal (plural)

> | ### 7.2.1 ideal (plural) For PLURAL ideals are left ideals, unless stated otherwise. 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 (plural). 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.
> 7.2.1.1 ideal declarations (plural) |  |
> 7.2.1.2 ideal expressions (plural) |  |
> 7.2.1.3 ideal operations (plural) |  |
> 7.2.1.4 ideal related functions (plural) |  |

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