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[tex]P(0) + \lambda(\frac{dP}{d\tau})_o[/tex]

But since the worldline, [tex]P(\tau)[/tex] is paramtrized by [tex]\tau[/tex] and

*not*[tex]\lambda[/tex], then shouldn't the equation be:

[tex]P(0) + \tau(\frac{dP}{d\tau})_o[/tex]

?

Thanks in advance.