Some Problems for Sobolev Spaces on the Half-line
Informatics and Automation, Function spaces, approximation theory, and nonlinear analysis, Tome 255 (2006), pp. 161-169.

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This paper is a survey of the results obtained by the author in 1996–2004 and connected with extrapolation, extension, sharp constants in Kolmogorov-type inequalities, and related questions. For the most important theorems, the key steps in the proofs are presented, which may be of independent interest.
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G. A. Kalyabin. Some Problems for Sobolev Spaces on the Half-line. Informatics and Automation, Function spaces, approximation theory, and nonlinear analysis, Tome 255 (2006), pp. 161-169. http://geodesic.mathdoc.fr/item/TRSPY_2006_255_a11/

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