What is the top cross-section of the third order of accuracy?

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Multiple Choice

What is the top cross-section of the third order of accuracy?

In two-dimensional discretization, achieving third-order accuracy typically uses a 5-by-5 stencil—the calculation at a point depends on a square block of five points in each direction. In the test’s convention, that footprint translates into a cross-section sized 25 by 25. So the top cross-section for third-order accuracy is 25 x 25. The other sizes would imply larger stencils (more points) than needed for third order, or correspond to different, higher-order schemes.

In two-dimensional discretization, achieving third-order accuracy typically uses a 5-by-5 stencil—the calculation at a point depends on a square block of five points in each direction. In the test’s convention, that footprint translates into a cross-section sized 25 by 25. So the top cross-section for third-order accuracy is 25 x 25. The other sizes would imply larger stencils (more points) than needed for third order, or correspond to different, higher-order schemes.

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