The title of the node is mean to read εijk
, but node titles cannot contain subscripts.
is a third rank tensor
, which takes the value 1 when (ijk) is an even permutation
of (123) (ie. (123),(231),(312)), the value -1 if (ijk) is an odd permutation of (123) (ie. (321),(213),(321)), and is zero if otherwise.
It is used for expression vector products in abstract index notation
, eg a
, similarly for curl b
if you replace a
You can also write the determinant
of a 3×3 matrix A