Agmon--Kolmogorov Inequalities on $\ell^2(\Bbb Z^d)$
- Arman Sahovic
Abstract
Landau--Kolmogorov inequalities have been extensively studied on both continuous and discrete domains for an entire century. However, the research is limited to the study of functions and sequences on $\Bbb R$ and $\Bbb Z$, with no equivalent inequalities in higher-dimensional spaces. The aim of this paper is to obtain a new class of discrete Landau--Kolmogorov type inequalities of arbitrary dimension:$$\|\varphi\|_{\ell^\infty(\Bbb Z^d)}\leq\mu_{p,d}\|\nabla_D\varphi\|^{p/2^d}_{\ell^2(\Bbb Z^d)}\, \|\varphi\|^{1-p/2^d}_{\ell^2(\Bbb Z^d)},$$where the constant $\mu_{p,d}$ is explicitly specified. In fact, this also generalises the discrete Agmon inequality to higher dimension, which in the corresponding continuous case is not possible.- Full Text:
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- DOI:10.5539/jmr.v6n2p38
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