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:'''Indices of vectors are written as superscripts.'''
:'''Indices of vectors are written as superscripts.'''
Get used to seeing things written that way.
Get used to seeing things written that way.
Vectors are "contravariant first-rank tensors". Contravariant tensors have their indices written as superscripts, while covariant tensors have their indices written as subscripts.
So, the components of the above vector could be written <math>\vec{\boldsymbol{x}}=(x^1,x^2,x^3)</math>.
So, the components of the above vector could be written <math>\vec{\boldsymbol{x}}=(x^1,x^2,x^3)</math>.