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&&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)}|}
{\rm N}(0,0,1,1,0) = \frac{1}{2\pi}\exp\left(\frac{x^2   y^2}{2}\right)
\min_{x, y, z} \;\; x^2   y^2   z^2 \\
\rm{s.t.} \;\; x   y   z = 1.