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Example weak solution:

By Doob’s inequality, the result follows.

Example strong solution:

Let ( M_n ) be a martingale. Doob’s maximal inequality states ( \mathbbP(\sup_k\le n |M_k| \ge \lambda) \le \fracM_n\lambda ). Here, we first show ( \mathbbE[|M_n|] ) is bounded by …

Guess which one actually helps you learn.

Let $X$ and $Y$ be independent random variables, both uniformly distributed on the interval $[0, 1]$. Find the probability density function (PDF) of the random variable $Z = X + Y$.