MathSciNet bibliographic data MR1276138 35P20 (35J10 47F05) Solomyak, M. Piecewise-polynomial approximation of functions from \$H\sp l((0,1)\sp d)\$$H\sp l((0,1)\sp d)$, \$2l=d\$$2l=d$, and applications to the spectral theory of the Schrödinger operator. Israel J. Math. 86 (1994), no. 1-3, 253–275. Article

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