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Please attached snapshot. Does the integral 7.9 equal to 0.5 [itex]\int[/itex]h_{μ}_{σ}dz^{μ}/dτ dz^{σ}/dτdτ ?

I'm confused as to the fourth power of Dirac's Delta. Then where does the derivative on x go ?

For more on this, see MTW pg180

thanks

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# Dirac delta to the fourth

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