### 4.17.3 resolution related functions

`betti`
  Betti numbers of a resolution (see betti)
`lres`
  free resolution (see lres)
`minres`
  minimize a free resolution (see minres)
`mres`
  minimal free resolution of an ideal, resp. module and a minimal set of generators of the given ideal, resp. module (see mres)
`res`
  free resolution of an ideal, resp. module, but not changing the given ideal, resp. module (see res)
`sres`
  free resolution of a standard basis (see sres)

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