Singular Manual: ring related functions

| ### 4.19.3 ring related functions `charstr` description of the coefficient field of a ring (see charstr) `keepring` move ring to next upper level (see keepring) `npars` number of ring parameters (see npars) `nvars` number of ring variables (see nvars) `ordstr` monomial ordering of a ring (see ordstr) `parstr` names of all ring parameters or the name of the n-th ring parameter (see parstr) `qring` quotient ring (see qring) `ringlist` decomposition of a ring into a list of its components (see ringlist) `setring` setting of a new basering (see setring) `varstr` names of all ring variables or the name of the n-th ring variable (see varstr)

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