An improved and corrected version of the functional limit theorem is proved establishing weak convergence of random walks generated by compound doubly stochastic Poisson processes (compound Cox processes) to Lévy processes in the Skorokhod space under more realistic moment conditions. As corollaries, theorems are proved on convergence of random walks with jumps having finite variances to Lévy processes with variance-mean mixed normal distributions, in particular, to stable Lévy processes, generalized hyperbolic and generalized variance-gamma Lévy processes.
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* Research supported by Russian Scientific Foundation, project 14-11-00364.
Proceedings of the XXXII International Seminar on Stability Problems for Stochastic Models, Trondheim, Norway, June 16–21, 2014
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Korolev, V.Y., Chertok, A.V., Korchagin, A.Y. et al. A Note on Functional Limit Theorems for Compound Cox Processes*. J Math Sci 218, 182–194 (2016). https://doi.org/10.1007/s10958-016-3020-x
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DOI: https://doi.org/10.1007/s10958-016-3020-x