Abstract
Let γ = (γ1 ,..., γd ) be a vector with positive components and let Dγ be the corresponding mixed derivative (of order γj with respect to the j th variable). In the case where d > 1 and 0 < k < r are arbitrary, we prove that
and
for all
Moreover, if \(\bar \beta \) is the least possible value of the exponent β in this inequality, then
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 56, No. 5, pp. 579–594, May, 2004.
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Babenko, V.F., Korneichuk, N.P. & Pichugov, S.A. Kolmogorov-type inequalities for mixed derivatives of functions of many variables. Ukr Math J 56, 699–717 (2004). https://doi.org/10.1007/PL00022170
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DOI: https://doi.org/10.1007/PL00022170