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Cybernetics And Systems Analysis
International Theoretical Science Journal
UDC 519.21
V.P. Knopova

SMALL-TIME LIMIT BEHAVIOR OF THE PROBABILITY
THAT A LÉVY PROCESS STAYS POSITIVE

Abstract. In the paper, we find analytically the upper and lower limits (as the time parameter tends to zero) of the probability that the Lévy process staring at 0 stays positive. We confine ourselves to the situation where the real and imaginary parts of the characteristic function are regularly varying at infinity. In this case, we can calculate the bound, and sometimes the exact values of the respective upper and lower limits.

Keywords: Lévy process, probability measure, limit behaviour in small time.



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Knopova Victoriya Pavlovna,
Phd, senior research fellow, V.M. Glushkov Institute of Cybernetics of NAS of Ukraine, Kyiv,
e-mail: vicknopova@googlemail.com.

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