Tensors and Coordinates
contra- and covariant- vectors,
second rank, direct product,
basis vectors, metric tensor,
example: contra- vs. co- variant components,
example: gij and gij,
example: the contra- and co- variant basis,
covariant derivatives, coefficient of connection (Gamma),
derivatives, Christofell symbols,
Gamma from metric tensor,
covariant divergence,
covariant Laplacian,
