Einstein notation is a way to represent contracting a covariant component with a contravariant component. I don't see what you could mean by saying NN applications involve Einstein notation but not covariant and contravariant transformations.
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Einstein notation is a way to represent contracting a covariant component with a contravariant component. I don't see what you could mean by saying NN applications involve Einstein notation but not covariant and contravariant transformations.