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Homework Statement
I am self studying relativity. In Wikipedia under the four-gradient section, the contravariant four-vector looks wrong from an Einstein summation notation point of view.
https://en.wikipedia.org/wiki/Four-vector
Homework Equations
It states:
E0∂0-E1∂1-E2∂2-E3∂3 = Eα∂α
The Attempt at a Solution
As it is it looks wrong to me. Is it wrong or is it NOT ESN or something else?