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Difference differential operators with values at the midpoints of the sides of cells of a triangular grid. (English. Russian original) Zbl 1452.65300

Mosc. Univ. Comput. Math. Cybern. 44, No. 2, 97-108 (2020); translation from Vestn. Mosk. Univ., Ser. XV 2020, No. 2, 48-60 (2020).
MSC:  65N06 65N50
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