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2.3.12 Stencil diagrams: centering in time

Figure 8: Stencil diagrams with different time-centering: FTCS, time-centered implicit, BTCS, CTCS (leapfrog).
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Figure 8 shows stencil diagrams for 4 schemes with CS and different time centering: In implicit schemes each value at the new time level typically depends on all values at the old level: The full domain of dependence is larger than the direct domain of dependence.