@Torre Thank you very much. I will try.

Leonid

@Torre Thanks!

I get the Christoffel with a correct Maple command for a given space-time element. I try use and "Physics", and "tensor", and "Differentialgeometry" packages. It ssems to me Maple does not allow create a new object from a given stndard objects for a given metric. The old program "GRTENSOR" make it easily, but it does not work under modern Maple..

Thanks

Leonid