Complex sentence: In this article, index notation and the Minkowski metric (+ − − −) will be used, see also Ricci calculus, covariance and contravariance of vectors and raising and lowering indices for more details on notation.
Split into simpler sentences: In this article, index notation and the sign convention (+ − − −) are used for the Minkowski metric. See also Ricci calculus, covariance and contravariance of vectors and raising and lowering indices for more details on notation.