### 4.8.5 intmat related functions

`betti`
  Betti numbers of a free resolution (see betti)
`det`
  determinant (see det)
`ncols`
  number of cols (see ncols)
`nrows`
  number of rows (see nrows)
`random`
  pseudo random intmat (see random)
`size`
  total number of entries (see size)
`transpose`
  transpose of an intmat (see transpose)
`trace`
  trace of an intmat (see trace)

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