### 4.15.4 number related functions

`cleardenom`
  cancellation of denominators of numbers in polyomial and divide it by its content (see cleardenom)
`impart`
  imaginary part of a complex number, 0 otherwise (see impart, repart)
`numerator, denominator`
  the numerator/denominator of a rational number (see numerator, denominator)
`leadcoef`
  coefficient of the leading term (see leadcoef)
`par`
  n-th parameter of the basering (see par)
`pardeg`
  degree of a number in ring parameters (see pardeg)
`parstr`
  string form of ring parameters (see parstr)
`repart`
  real part of a complex number (see impart, repart)

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