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{\rm d}x(t) = a(x, t){\rm d}t   b(x, t){\rm d}W_t
p_{[a-b-c]}=p_a\frac{p_b}{1-p_a}\frac{p_c}{1-p_a-p_b}+p_a\frac{p_c}{1-p_a}\frac{p_b}{1-p_a-p_c}
&&x = \sqrt{D}, \\
&&p_0 = 0, \\
&&q_0 = 1, \\
&&a_k =\lfloor \frac{x   p_k}{q_k} \rfloor, \;\; k \ge 0, \\
&&p_{k 1} = a_k Q_k - p_k, \;\; k \ge 0, \\
&&q_{k 1} = \frac{D  - p_{k   1}^2}{q_k}, \;\; k \ge 0.
\sum_{i=t}^{t K-1} {\rm data}[i] = \sum_{i=t-1}^{(t-1) K-1} {\rm data}[i] - {\rm data}[t-1]   {\rm data[t K-1]}
{\rm rank}(v) = \sum_{w \in \delta^-{(v)}} \frac{{\rm rank}(w)}{|\delta^ {(w)}|}