[HPforGrownups] Schroedinger's Stag

[Dave Hardenbrook]

No: HPFGUIDX 19821

At 12:00 PM 5/30/01 +0000, Amy Z wrote:
>The only reason SecondHarry cast the Patronus--the thing that made him
>able to do it--was that FirstHarry saw him do it.  So which happened
>"first"?  It can't be that FirstHarry happened "first," because
>FirstHarry witnessed SecondHarry conjuring the Patronus.  It can't be
>that SecondHarry happened "first," because he only conjured the
>Patronus because FirstHarry had seen it conjured.
>
>Therefore, it is impossible for either one of them to have happened
>before the other.  Each event is the cause of the other.

And that's exactly what a "Closed Timelike Loop" is -- Thanks, Amy,
for explaining it much better than I did.  :)



                         -- Dave