By A. A. Borovkov, K. A. Borovkov

ISBN-10: 052188117X

ISBN-13: 9780521881173

This ebook makes a speciality of the asymptotic habit of the chances of huge deviations of the trajectories of random walks with 'heavy-tailed' (in specific, frequently various, sub- and semiexponential) leap distributions. huge deviation possibilities are of significant curiosity in several utilized components, ordinary examples being break chances in danger thought, errors possibilities in mathematical records, and buffer-overflow chances in queueing thought. The classical huge deviation conception, built for distributions decaying exponentially speedy (or even swifter) at infinity, more often than not makes use of analytical tools. If the short decay fails, that is the case in lots of vital utilized difficulties, then direct probabilistic tools often turn out to be effective. This monograph provides a unified and systematic exposition of the big deviation conception for heavy-tailed random walks. many of the effects provided within the publication are showing in a monograph for the 1st time. lots of them have been bought via the authors.

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17(ii) for p = 1/2. 5 on p. 17). Clearly, G0 ∈ L (cf. 4(i)). 21) for G0 (t), p = 1/2 and the chosen M = M (t). 20) also holds for G0 (t). 17(i)). 21) for G0 (t). The theorem is proved. 3 Further sufﬁcient conditions for distributions to belong to S. 17 essentially gives necessary and sufﬁcient conditions for a distribution to belong to S. 21, which, as we will see from what follows, are quite narrow. To construct broader (in a certain sense) sufﬁcient conditions, we will introduce the class of so-called semiexponential distributions.

11) 20 Preliminaries and it is clear that one can always ﬁnd a distribution G (with a negative mean) such that g(μ) = 1. c. function. 2) is an extension of the class S, distributions from the former class possessing many properties of distributions from S. 8. First we will prove that S ⊂ L. Since the deﬁnitions of both classes are given in terms of the right distribution tails, one can assume without loss of generality that G ∈ S+ (or just consider from the very beginning the distribution G+ ).

The lemma is proved. 28. 36). 28 is proved. 25 will be preceded by the following lemma. 30. 43) t0 u t. 44) h(t0 )(t/t0 )γ . Proof. 37) holds. Since l(t) → ∞, we can assume without loss of generality that γ0 + 1 γ0 γ := . 38) with s0 = t0 , denote by h(t) the continuous piecewise linear function with nodes at the points (sn , l(sn )), n 0: h(t) := l(sn ) + l(sn+1 ) − l(sn ) (t − sn ), z(sn ) t ∈ [sn , sn+1 ]. 39), we have thus deﬁned the function h(t) on the entire half-line [t0 , ∞) (its deﬁnition on the left of the point t0 is inessential for our purposes).

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