On Thursday, September 18, 2025 at 11:31:57 PM UTC-6 Brent Meeker wrote:
On 9/18/2025 8:27 AM, Alan Grayson wrote: You keep saying that as if it's a mantra. What's a change in direction if it not deviation from a straight path? *In your neutron star example of turnaround, the motion starts as a straight line but continues turning for awhile. More important is your claim the GR cannot be used to solve the TP, yet here you are using it. AG * *TP is not a problem. So what do you mean by "solve"it; make AG stop posting about it? * *If it's not a problem why did E write about it? It becomes a "problem" if you make an error when positing it. So "solving it" makes sense. AG* * I already wrote a post explaining how the examples I've created each eliminate one of the causes that students often mistakenly think of as causing the aging difference.* *Brent* *If you have two different paths in spacetime with the same starting and end events, each path length is invariant under the LT, but as far as I know there's no way to compare the paths to determine their relative lengths. If this is true, even when it appears that one is shorter than another, there doesn't seem to be a way to make the comparison to determine which has shorter proper time. Is this correct, and if not, why? TY, AG* -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/2113e8cb-b08c-4291-bdd4-1d85b29816dan%40googlegroups.com.
