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- In each case, (a) or (b), spins are generated according to
distribution
and so values of
observables are calculated as
- If we had not been careful about generating the spin values,
but say chosen them uniformly, then we must use
- This is correct, but numerically hopeless. The wide variation
in exponential (remember H proportional to size) would give a
huge standard deviation in
.
Geoffrey Fox, 
Northeast Parallel Architectures Center at Syracuse University, gcf@npac.syr.edu