- #1
noahcharris
- 21
- 0
Hey all, I'm just starting into GR and learning about tensors. The idea of fully co/contravariant tensors makes sense to me, but I don't understand how a single tensor could have both covariant AND contravariant indices/components, since each component is represented by a number in each index. And yet there must be a mixture of sorts because of all the upper/lowercase indices in GR. Any illumination would be much appreciated, thanks!