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Apr2-12, 11:11 AM
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Quote Quote by harrylin View Post
In that paper Einstein calculated clock retardation from a single perspective. It's essential for a possible paradox to describe the situation from the perspective of each twin.
You're right, Einstein didn't go into the details of the Doppler shifts that each clock would see of the other ones clock like the 1911 paper did, but that also is not what is meant by the paradoxical nature of the "twins paradox". The "paradox" in the "twins paradox" is what happens when you assign a Frame of Reference to both inertial portions of the traveling twin's trip during which his clock ticks normally while the home twin's clock ticks slower while in the home twin's FoR, his clock is ticking normally while the traveling twin's clock is ticking slower.

But if you use just one FoR for the entire scenario, there is no paradox, which is what Einstein did.

So as you said, the 1911 paper also does not treat the "twins paradox" as a paradox, so I don't know why you want to give credit to it for first discussion of the "twins paradox" when it was Einstein who was first.