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black_hole
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Homework Statement
As part of a problem I am doing I am asked to show uβ∂βuα = aα where u is 4 velocity and a refers to 4 acceleration. The way to do this is not immediately obvious to me, especially since the problem implies there should be a chain rule step involved which I am not seeing. I thought ∂ refers to ∂/∂t + ∂/∂x ect.
Homework Equations
The Attempt at a Solution
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