`set_upkara', `set_uptkara', `set_upfft'
----------------------------------------

set_upkara([THRESHOLD])
set_uptkara([THRESHOLD])
set_upfft([THRESHOLD])
     :: Set thresholds in the selection of an algorithm from N^2,
     Karatsuba, FFT algorithms for univariate polynomial multiplication.

RETURN
     value currently set

THRESHOLD
     non-negative integer

   * These functions set thresholds in the selection of an algorithm
     from N^2, Karatsuba, FFT algorithms for univariate polynomial
     multiplication.

   * Products of univariate polynomials are computed by N^2, Karatsuba,
     FFT algorithms. The algorithm selection is done according to the
     degrees of input polynomials and the thresholds.

   * See the description of each function for details.

References
     *Note `kmul ksquare ktmul': kmul ksquare ktmul, *Note `umul
     umul_ff usquare usquare_ff utmul utmul_ff': umul umul_ff usquare
     usquare_ff utmul utmul_ff.

