MATH375 Class Test 2
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MATH375 Class Test 2
In all questions below (W (t), t > 0) is a standard Brownian motion and (于(t), t > 0) is its natural filtration.
1. Consider the following stochastic differential equations:
where α and β are constants. Find the differentials of X〇 (t) and Y2 (t). What values should α and β take so that X〇 (t) and Y2 (t) are martingales with respect to (于(t), t > 0)?
2. Let a, b, σ, be positive constants, and X尸 a real number. The differential of the process (X(t), t > 0) is:
Find solution X(t) of this equation. What is the distribution of X(t)?
3. Let a and b be given constants. Also let the random variable X be defined as: X := cos(aW (T) + b).
Find the representation:
i.e. find 3[X] and the process (f(t), t e [0, T]).
2022-01-17