FUNCTION:  Degrees   - Degrees of the basic polynomial invariants 
           Exponents - Exponents of a root system,    
CALLING SEQUENCE:  Degrees(R);,                   Exponents(R);,    
PARAMETERS:  R = a root system data Structure,SYNOPSIS:   
  Degrees(R) returns a sorted list of the Degrees of the basic polynomial
  invariants of the Coxeter group W(R).
  Exponents(R) returns a sorted list of the Exponents of R. The Exponents
  [e_1,...,e_n] have several equivalent definitions, one being that if m
  is the Coxeter number of R and z is a primitive m-th root of unity, then
  they are the unique positive integers < m such that z^(e_1),...,z^(e_n)
  are the eigenvalues of a Coxeter element.
  The Exponents e_i and Degrees d_i are related:  d_i = e_i + 1.
  For a description of root system data Structures, see Coxeter[Structure].
EXAMPLES:   
  Degrees(D6);                        yields     [2,4,6,6,8,10]
  Exponents(H4);                      yields      [1,11,19,29],    
SEE ALSO:  CoxNumber, LengthGF, Structure):
