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most citedA Littlewood-Paley type theorem on orthoprojectors onto mutually orthogonal subspaces of piecewise polynomial functions and its corollary

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math.CA2019

Extending functions from Nikolskii-Besov spaces of mixed smoothness beyond a cube

S. N. Kudryavtsev

The article examines Nikolskii and Besov spaces with norms defined using "-averaged" mixed moduli of continuity of functions of appropriate orders, instead of mixed moduli of…