Fig. 13
Restriction of fine-grid points (see the bottom plane) to coarse-grid ones (see the top plane). Restriction to the coarse-grid node (i,j) is performed using the data of nine fine-grid nodes making up a 3 × 3 stencil, indicated by the brighter area of the bottom plane, with the central (2i,2j) grid node. See the text for details.
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