I have heard a phrase somewhere, which can be reduced to the following two points: 1) There exists a handy and underused mathematical apparatus applicable to GR, comparing to which tensor calculus is obsolete. 2) The apparatus is related to graphs.
Does anybody have an idea, what could this apparatus be?
Maybe people talked about Penrose graphical notation or related inventions.
(The question is a little vague and I'm not use if "obsolete" is really the word. Watch out, the last time someone complained about tensors here, Ron Maimon gave a raging answer, which resembed an anvanced lecture in theoretical linguistics.)
