= Einstein notation
{wiki=Einstein_notation}
Einstein notation, also known as Einstein summation convention, is a notational scheme used primarily in the fields of mathematics and physics to simplify expressions involving tensors and multi-indexed arrays. It was introduced by the physicist Albert Einstein in the context of his work on the theory of relativity. The key principle of Einstein notation is that when an index variable appears twice in a single term, it implies a summation over that index.
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