假如
<bblatex>\begin{eqnarray}
F(x_1, \ldots, x_n) \nonumber
&=&
\begin{cases}
\min\{x_1,x_2,\ldots, x_n\}, &\mbox{if } 0\le\min\{x_1, x_2, \ldots, x_n\}\le 1\\
1, &\mbox{if } 1< \min\{x_1, x_2, \ldots, x_n\}\\
0, &\mbox{if } \min\{x_1, x_2, \ldots, x_n\}< 0\\
\end{cases} \\\nonumber
\end{eqnarray}</bblatex>
很容易验证<bblatex>X_i</bblatex>全部是[0, 1]的uniform distribution,问题是:If <bblatex>X_i</bblatex>s are r.v.s on a probability space having joint distribution <bblatex>F</bblatex>, then find a functional relationship that <bblatex>X_i</bblatex> satisfy.