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and
:<math> v_{ij}\big ( \mathbf{x} - \mathbf{c}_i \big ) \ \stackrel{\mathrm{def}}{=}\ \begin{cases} \delta_{1jij} \rho \big ( \left \Vert \mathbf{x} - \mathbf{c}_i \right \Vert \big ) , & \mbox{if } i \in [1,N] \\ \left ( x_{ij} - c_{ij} \right ) \rho \big ( \left \Vert \mathbf{x} - \mathbf{c}_i \right \Vert \big ) , & \mbox{if }i \in [N+1,2N] \end{cases} </math>
in the unnormalized case and
:<math> v_{ij}\big ( \mathbf{x} - \mathbf{c}_i \big ) \ \stackrel{\mathrm{def}}{=}\ \begin{cases} \delta_{1jij} u \big ( \left \Vert \mathbf{x} - \mathbf{c}_i \right \Vert \big ) , & \mbox{if } i \in [1,N] \\ \left ( x_{ij} - c_{ij} \right ) u \big ( \left \Vert \mathbf{x} - \mathbf{c}_i \right \Vert \big ) , & \mbox{if }i \in [N+1,2N] \end{cases} </math>
in the normalized case.
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