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Four-momentum

A massive particle has four-momentum

P^{μ} = (E / c, p) = mγ (c, v), P^{2} = m^{2} c^{2} .

For a massless particle,

P^{μ} = (E / c, p)

with

E = c ∣ p ∣

and

P^{2} = 0

.

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