The diagrammatic notation is very useful in manipulating tensor algebra. It usually involves a few simple "identities" of tensor manipulations.
For example, where n is the number of dimensions, is a common "identity".
Read more about this topic: Penrose Graphical Notation
Famous quotes containing the word manipulation:
“The principle that human nature, in its psychological aspects, is nothing more than a product of history and given social relations removes all barriers to coercion and manipulation by the powerful.”
—Noam Chomsky (b. 1928)