\input{_preamble}
\begin{document}
    \myeqs{
        \mathcal{N}_{i,0}^{\boldsymbol{U}^{(k)}}(u)
        =
        \begin{cases}
            1, & u\in\left[u_i^{(k)},u_{i+1}^{(k)}\right)\,\lor\, (i=n-k \land u=1)\\
            0, & \text{else}
        \end{cases}
    }
\end{document}