Maxima Function
uricci (dis)
This function first computes the
covariant components ric[i,j] of the Ricci tensor.
Then the mixed Ricci tensor is computed using the
contravariant metric tensor. If the value of the argument dis
is true, then these mixed components, uric[i,j] (the
index i is covariant and the index j is contravariant), will be displayed
directly. Otherwise, ricci(false) will simply compute the entries
of the array uric[i,j] without displaying the results.