On 9/10/2025 6:41 PM, Alan Grayson wrote:
Every point in spacetime has a label, called cooordinates. So every
event happens at some label.
But the label is arbitrary. You draw a different map and give it a
different label. But it's the same event. It doesn't become two
different events because two different brought different clocks to it.
If not that, then what? I see this in those spacetime diagrams. If
their clocks disagree at the reunion, how do you define "the event"? AG
It's the event of Red and Blue meeting again.
Brent
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