Mike Powell <[email protected]> writes: > if you wish > the result to also be a tensor, you must choose one contravariant and > one covariant index. So when Ruda writes A_ijkl*B_mknop, my guess is > that the two uses of the k index have different tensor types.
In principle and generality yes, but for the purely technical part I wanted to discuss here, this distinction did not matter much. [When you are lucky (eg., using cartesian coordinates in an Euclidian geometry) you may easily forget about the distinction altogether.] Thanks Ruda ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
