Long description: bar
Alt text: A horizontal line segment represents the spatial domain, labeled from 0 to l, with the variable x indicating the direction.
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- The image displays a horizontal line segment, suggesting a one-dimensional spatial domain.
- An arrow drawn above the line indicates the variable \(x\), pointing from left to right, suggesting the direction of the coordinate system.
- The bottom edge of the line segment is labeled with \(0\) at the left end and \(l\) at the right end, defining the spatial interval \([0, l]\).
- The side labels indicate the left boundary as \(u_L\) and the right boundary as \(u_R\), representing boundary values.