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How closely is this related to Penrose's graphical tensor notation? https://en.wikipedia.org/wiki/Penrose_graphical_notation https://en.wikipedia.org/wiki/Penr

• letlambda 9y ago
  I think the major difference is this notation has the count of loose wires corresponding to dimension, and Penrose notation has the count of loose wires corresponding to tensor valence. Here, a diagram with 1L and 2R wires corresponds to a 2d-vector, in Penrose's notation it would correspond to a (1,2) tensor that takes kd-vectors to kXk matrices. But... they certainly have a similar feel. I wonder if you could build up the Penrose notation out of this.