Singular Manual: qring (plural)

> | ### 7.2.5 qring (plural) offers the possibility to compute within factor-rings modulo two-sided ideals. The ideal has to be given as a two-sided Groebner basis (see twostd (plural) command). For a detailed description of the concept of rings and quotient rings see Rings and orderings.
> 7.2.5.1 qring declaration (plural) |  |
> 7.2.5.2 qring related functions (plural) |  |
Note: we highly recommend to turn on `option(redSB); option(redTail);` while computing in qrings. Otherwise results may have a difficult interpretation.

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