### 4.1.4 cring related functions

`crossprod`
  crooss product of several objects of type cring (see crossprod)
`Float`
  several variants of Floating point (inexact) real and complex numbers (see Float).
`flintQ`
  multivariate rational functions over Q (via flint, requires >=2.5.3) (see flintQ).

See Float; crossprod; flintQ.

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