Special Relativity - Lorentz Force Law

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Nusc

Homework Statement

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

F = E + v x B.

What's U?

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Phrak

U^v looks like a four velocity with a raised index. What is E_uv?

Nusc

I have no idea, the question doesn't say.

Nusc

Anyone else have an idea?