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{\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.
\frac{iY * (iY 1)}{2} - iY \leq iX \leq \frac{iY * (iY 1)}{2} - 1
\binom{n}{k} = \binom{n-1}{k}   \binom{n-1}{k-1}

\phi(x) = f(x)   \lambda \int_a^x K(x,t)\,\phi(t)\,dt