On Sunday, November 18, 2018 at 9:14:25 PM UTC, Philip Thrift wrote:
> On Sunday, November 18, 2018 at 11:49:57 AM UTC-6, agrays...@gmail.com 
> wrote:
>> *For the simple case of two histories, presumably of particles, how does 
>> Feynman introduce interference? What's the conceptual framework for 
>> interference among or between histories? TIA, AG *
> Attached to each history is an "evolving" *unit complex number* [ 
> https://en.wikipedia.org/wiki/Circle_group ], or UCN (the complex numbers 
> of modulus 1). When histories are "summed" (the sum of UCNs at the end of 
> the histories that go to the same end point)  there is "interference" (just 
> in the way complex numbers add up, since you can have a UCN pointing in one 
> direction and another 180 plus or minus x degrees opposite). The modulus of 
> that sum is then the "weight" for that end point.
> - pt

*So Feynman adds this additional hypothesis to QM. Is this kosher? Also, 
doesn't he used forward and backward in time histories? Finally, how does 
he choose the histories and presumably eliminate forward and backward 
spatial loops, or doesn't this matter? AG *

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