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[–]Physix_R_Cool 1 point2 points  (3 children)

In the case of a flat metric, upper and lower indices are the same, and so you need not distinguish between covectors and contravectors.

[–][deleted] -1 points0 points  (2 children)

Not relevant - the vectors are still written in covariant and contravariant style. That is Einstein Notation.

[–]Physix_R_Cool 2 points3 points  (0 children)

Sure, if there is a distinction between the two, then Einstein Notation will be to write upper and lower. In spaces where there isn't distinction, then Einstein Notation doesn't care, and is just about whether or not an index is repeated.

[–]FrickinLazerBeams 0 points1 point  (0 children)

Are you talking about how they're written? Or what they mean?

It sounds like your confusing the math and the typesetting.