User:Rain
<math>\Delta M_i^{-1} = -a \sum_{n=1}^N D_i \left[ n \right] \left[ \sum_{j \in \mathbb{C} \{i \}} F_{ij} \left[ n-1 \right] + F\operatorname{ext}_i \left[ n^{-1} \right] \right]</math>
<math>\Delta M_i^{-1} = -a \sum_{n=1}^N D_i \left[ n \right] \left[ \sum_{j \in \mathbb{C} \{i \}} F_{ij} \left[ n-1 \right] + F\operatorname{ext}_i \left[ n^{-1} \right] \right]</math>