@SALJAM_ (basically, delta is good for dot product, epsilon is good for cross product/determinants/sums with alternating signs)
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@SALJAM_ ah, I found a book about not braids, but graphs and tensors - I wasn't completely misleading you! ( https://books.google.co.uk/books?id=xmQGV0bi-S0C&pg=PA21&lpg=PA21&dq=primitive+tensors+kronecker+levi-civita&source=bl&ots=exj85OaDkB&sig=dE0lJPRGD0bwrgvc-IHhYD7gdQo&hl=en&sa=X&ved=0CCcQ6AEwAWoVChMInNPKtO_AyAIVRj0aCh2GmAIC#v=onepage&q&f=false … )
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