It may seem like the probability of a nucleation event
must depend on the previous events since the available fraction of
untransformed wire (for the occurrence of a nucleation event) is a decreasing
function of time. However, such considerations will not affect our result
since any nucleation event which would have occurred inside a time cone
(representing the transformed region of a previous event) will have its
time cone lying completely inside the former. Since we are looking
the probability of untransformed wire, such `ghost' nucleation events
cannot change our results.
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