FUNCTION: LieTools/G2eh
USAGE: G2eh(i);
SYNOPSIS: G2eh(i) converts an integer i in {1,...,dimg} to the expression for 
  the corresponding Cartan-Weyl basis element of g in the notation where the 
  C-W basis elements of g are
     {e[-nprts],...e[-1],h[1],...,h[rnk],e[1],...,e[nprts]}

CAVEATS: requires a previously initialized global Lie algebra environment.
  (See LieTools[gSetup].)
EXAMPLE: 
> LieTools[gSetup](A,1):
Setting up Gtype = A   rnk = 1
> LieTools[G2eh](1); LieTools[G2eh](2); LieTools[G2eh](3);

                                e[-1]


                                 h[1]


                                 e[1]



SEE ALSO: 
