# Einstein Summation

The summation notation suggested by Einstein (1916) is a
concise mathematical notation that implicitly sums over repeated indices of n-dimensional arrays. Many ordinary
matrix operations (e.g. transpose, matrix multiplication, scalar product, 'diag()', trace etc.)
can be written using Einstein notation. The notation is particularly convenient for
expressing operations on arrays with more than two dimensions because the
respective operators ('tensor products') might not have a standardized name.