[ caPhi ] = EDTEntireFunction( mArgument, iUpToOrder )
    caPhi{1} = \phi_{vOrders(1)}(mArgument)
  \phi_0 = exp(mArgument)
  \phi_k = (\phi_{k-1} - \frac{1}{(k-1)!})/mArgument
 
  note: returns NaN for mArgument = 0 (I dont fix this for posibble
  performance upgrade outside).