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Tensors drawn as shapes with legs.
Also known as: Tensor diagram notation, Penrose diagram notation
The diagrammatic notation writing tensor expressions as shapes joined by lines.
Writes tensor expressions as diagrams in which shapes are tensors and joined lines are contracted indices.
Contexts: Mathematics, Technical drawing
Removes index bookkeeping entirely: a contraction is a join, so expressions that require careful index tracking in symbols become visibly obvious, and errors that are easy to make in algebra are hard to draw.
Contexts: Mathematics, Technical drawing
Underlies the tensor network diagrams used in quantum information and in machine learning, so a notation devised for relativity is now read far outside it.
Contexts: Mathematics, Technical drawing
Shapes standing for tensors with lines projecting from them for indices, joined line to line where indices are contracted.