Copyright 1997 - Gilles.HUNAULT@univ-angers.fr http://www.info.univ-angers.fr/pub/gh/gh.html
The method has been found but not implemented.
This is NOT the case in SL3 either for tensor or symmetric products.
It should be done for mid-september.
Copyright 1997 - Gilles.HUNAULT@univ-angers.fr http://www.info.univ-angers.fr/pub/gh/gh.html