- Usage:
`b = hasRationalSing F`

- Function: hasRationalSing
- Inputs:
`F`, a list, a regular sequence (of polynomials)

- Outputs:
`b`, a Boolean value, answers: are the singularities of the given variety at most rational?

i1 : R = QQ[x_1..x_4]; |

i2 : multiplierIdeal(ideal {x_1^3 - x_2^2, x_2^3 - x_3^2}, 31/18) 2 2 o2 = ideal (x , x , x x , x ) 3 2 1 2 1 o2 : Ideal of R |

- jumpingCoefficients -- jumping coefficients and corresponding multiplier ideals