n>) aggragation functions, the following are the definitions: <span class="math display">\[\begin{equation}
    \tilde{\mu}(\mathbf{y}_j):=\min(\{y_{j1}, \cdots,y_{jm}\}),
\end{equation}\]</span> and <span class="math display">\[\begin{equation}
    \hat{\mu}(\mathbf{y}_j):=\max(\{y_{j1}, \cdots,y_{jm}\}).
\end{equation}\]</span></p>
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