Long description: d2
Alt text: A schematic diagram showing a central point with four surrounding points labeled in cardinal directions: up, down, left, and right.
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- The image displays a grid structure with a central point.
- This central point is labeled with \(u_0\).
- There are four surrounding points connected to the central point, representing neighbors in the North, South, East, and West directions.
- The labels for these surrounding points are \(u_N\) (North), \(u_S\) (South), \(u_E\) (East), and \(u_W\) (West).
- The arrangement suggests a discrete representation of a point on a grid with its immediate neighbors, typical in the context of elliptic partial differential equations.