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Lorentz factor
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===Bessel function=== The Bunney identity represents the Lorentz factor in terms of an infinite series of [[Bessel functions]]:<ref>Cameron R D Bunney and Jorma Louko 2023 Class. Quantum Grav. 40 155001</ref> <math display="block"> \sum_{m=1}^\infty \left(J^2_{m-1}(m\beta)+J^2_{m+1}(m\beta)\right)=\frac{1}{\sqrt{1-\beta^2}}.</math>
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