Variables X, and X2 follow generalized Wiener processes with drift rates fix and ix2 and variances a

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Variables X, and X2 follow generalized Wiener processes with drift rates fix and ix2 and variances a\ and of. What process does Xx + X2 follow if:

a. The changes in X{ and X2 in any short interval of time are uncorrelated?

b. There is a correlation p between the changes in X] and X2 in any short interval of time?

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