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From: Osher Doctorow on 23 Jul 2010 16:02
From Osher Doctorow

If every object in the Universe has an intrinsic ability to expand or
contract (repel or attract), although modified by a tendency to
preserve at least non-"disruptive" structures, then consider the
following:

1) P(A --> B) = 1 + P(AB) - P(A) (probability of repulsion or
expansion)

2) P(A <-- B) = -1 - P(AB) + P(A) (negative-probability measuring
attraction or contraction)

Notice what happens when attraction follows repulsion:

3) P(A --> B) + P(A <-- B) = 1 - 1 + P(AB) - P(AB) - P(A) + P(A) = 0

which as expected "cancels" out both. Here we have to be careful to
translate the first + as "followed by" even though its reverse since
gives 0, that is with the first two terms interchanged.

Although this does not tell us HOW an object decides to repel or
attract, it is an extremely simple probabilistic algebra of repulsion
and attraction, and it can be modified by multiplying either P(A-->B)
or P(A <-- B) by a real number in (0, 1) for partial repulsion or
partial attraction respectively.

Feynman theorized a negative probability, although it was very
specific to only a particular type of physics problem. And he did
not use P(A --> B) or similar concepts at all.

Osher Doctorow
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