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Going from Covariant to Contravariant
Use the rank-2 metric tensor
[flat spacetime].
Lower an index.
Raise two indices.
Memory aid: If the metric g has two indices raised up to the sky, it will be raising an index.
Slide 29 had lunch at 6 AM.
sweetser@alum.mit.edu
[flat spacetime].
Lower an index.
Raise two indices.
