cssExpts  the exponents of the canonical series solutions of I in the direction of a weight vector
Synopsis

 Usage:
 cssExpts(I,w)

Inputs:

I, holonomic ideal in a Weyl algebra D

w, List of (generic) weights for I, of length half the number of variables in D

Outputs:

a list, of exponents of the exponents of the canonical series solutions of I in the direction of (w,w), as in [SST, Theorem 2.3.11].