I am reading Einstein's original paper and trying to understand his work. I am an engineer, not a physicist, and the math in special relativity is not overly complicated, but I cannot duplicate one of his steps. He does leave out all the steps in his work.

This should be a simple differential of a parametric function, but I am missing something. My advanced calculus was 30 years ago, but I think (thought) I still have a reasonable grasp. A function tau of x' and t, where x' is itself a function of t.

Thanks

John

This should be a simple differential of a parametric function, but I am missing something. My advanced calculus was 30 years ago, but I think (thought) I still have a reasonable grasp. A function tau of x' and t, where x' is itself a function of t.

Thanks

John

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