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Differential equations with random variables
S
In class we wrote the equation dS
where d was the expected value of the
dt  d 1  n 
degree of a vertex and S was the expected size of the set of reachable vertices. What we
should have done is written an equation with random variables d and S. The variable d
has a probability distribution and we should have solved for the distribution of S and then
taken the expected value. Can you make the argument that for some class of equations
and probability distributions we can just write the equation in terms of expected values
and get the correct answer?
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