On Sunday, November 18, 2018 at 11:49:57 AM UTC-6, agrays...@gmail.com 
> *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

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