#### 7.2.7.3 ring related functions (plural)

`charstr`
  description of the coefficient field of a ring (see charstr)
`envelope`
  enveloping ring (see envelope)
`npars`
  number of ring parameters (see npars)
`nvars`
  number of ring variables (see nvars)
`opposite`
  opposite ring (see opposite)
`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 (plural))
`ringlist`
  decomposes a ring into a list of its components (see ringlist (plural))
`setring`
  set 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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