🚀 go-pugleaf

From James Gleick's GENIUS:
Feynman 25 Influence of future measurement on present dynamics.
p.146 "The field is a 'derived concept,' ... 'The field in actuality is
entirely determined by the the particles.' ...Just as radically, he
deprecated the wave function of Schrodinger, the now-orthodox means of
describing the fill state of a quantum-mechanical system at a given time.
It was practically useless, after all, when the interaction of particles
involved a time delay. 'We can take the viewpoint, then, that the wave
function is just a mathematical construction, useful under certain
conditions ... but not generally applicable.' p.147

Measurement was a problem: 'In the mathematics we must describe the system
for all times, and if a measurement is going to be made in the interval of
interest, this fact must be put somehow into the equaitons from the start."
Time was a problem: his approach required, ... 'speaking of states of the
system very far from the present."

This is clue why unitary proofs against FTL signals are not adequate.
Unitary evolution is only valid from one measurement to next in closed
system - a future measurement can reach back to determine initial ket.
That is how the photon pair polarization correlation of cos^2(theta)/2
for e-e' or o-o' coincidences is established. One measurement prepares,
the other analyses.