See also
Contravariant Tensor, Covariant Tensor, Index Gymnastics, Index Lowering, Tensor
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References
Misner, C. W.; Thorne, K. S.; and Wheeler, J. A. Gravitation. San Francisco, CA: W. H. Freeman, pp. 62 and 75-76, 1973.
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Cite this as:
Weisstein, Eric W. "Index Raising." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/IndexRaising.html