Special Relativity - Lorentz Force Law

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Nusc
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Homework Statement




Show that the 4-force law: F_u=q/c E_{uv}U^v leads to the usual Lorentz force law.


Homework Equations



F = E + v x B.

The Attempt at a Solution




What's U?
 
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Uv looks like a four velocity with a raised index. What is Euv?
 
I have no idea, the question doesn't say.
 
Anyone else have an idea?