Suppose that (X_{1}) is the change in the value of a variable during one time period and
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Suppose that \(X_{1}\) is the change in the value of a variable during one time period and \(X_{2}\) is the change in its value during the next time period. What is the correlation between \(X_{1}\) and \(X_{2}\) when the variable follows fractional Brownian motion with
(a) \(H>0.5\),
(b) \(H=0.5\), and
(c) \(H<0.5\), where \(H\) is the Hurst exponent?
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