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

This e-book makes a speciality of the asymptotic habit of the possibilities of enormous deviations of the trajectories of random walks with 'heavy-tailed' (in specific, frequently various, sub- and semiexponential) leap distributions. huge deviation percentages are of significant curiosity in different utilized components, standard examples being wreck possibilities in threat thought, errors chances in mathematical data, and buffer-overflow possibilities in queueing thought. The classical huge deviation idea, constructed for distributions decaying exponentially speedy (or even swifter) at infinity, in most cases makes use of analytical equipment. If the short decay fails, that is the case in lots of very important utilized difficulties, then direct probabilistic equipment often end up to be effective. This monograph provides a unified and systematic exposition of the massive deviation idea for heavy-tailed random walks. many of the effects awarded within the publication are showing in a monograph for the 1st time. a lot of them have been received by means of the authors.

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I) If α ∈ [0, 1) then ψ(λ) ∼ (ii) If α = 1 and ∞ 0 Γ(1 − α) V (1/λ) as λ λ ↓ 0. f. and, moreover, VI (t) as t → ∞. ∞ (iii) In any case, ψ(λ) ↑ VI (∞) = 0 V (t) dt ∞ as λ ↓ 0. 32), one obtains V (t) ∼ ψ(1/t) tΓ(1 − α) as t → ∞. f. as λ ↓ 0. Assertions of this kind are referred to as Tauberian theorems. In the present book, we will not be using such theorems, so we will not dwell on them here. 5. 17) one has the following relation for the ﬁrst integral in the case α < 1: ε/λ ε/λ −λt e V (t) dt εV (ε/λ) λ(1 − α) V (t) dt ∼ 0 0 λ ↓ 0.

12(ii), (iii) it follows immediately that if G ∈ S then also Gn∗ ∈ S, n = 2, 3, . . d. ’s ζ1 , . . 12(ii), one obtains that Gn∨ also belongs to S. d. ’s. This means that ‘large’ values of this sum are mainly due to the presence of a single ‘large’ summand ζi in it. One can easily see that this property is characteristic of subexponentiality. 15. 18 of [113]). 12(ii). 12. (i) First assume that c1 c2 > 0 and that both distributions Gi are concentrated on [0, ∞). 8). ’s. 17) where (see Fig. 1) P1 := P(ζ1 t − ζ2 , ζ2 ∈ [0, M )), P2 := P(ζ2 t − ζ1 , ζ1 ∈ [0, M )), P3 := P(ζ2 t − ζ1 , ζ1 ∈ [M, t − M )), P4 := P(ζ2 M, ζ1 t − M ).

17(ii) is satisﬁed. 30 one has |l(t)−h(t)| < γ, t t0 . 21) for the distribution Gh with Gh (t) = e−h(t) then they will be valid for the original distribution G as well.