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Re: superposition



It should be pointed out explicitly that superposition breaks down
for the electromagnetic field also at sufficiently extreme limits.
That field, too, exhibits nonlinearity, and a consequence of that
is that high energy gamma rays cannot be seen from great distances
in the universe because they collide with other radiation (the
microwave background) in otherwise free space. If superposition
were to hold electromagnetic radiation would not interact at all
with other electromagnetic radiation.

Leigh