Preface.- Equivalence of limit theorems for sums of random variables and renewal processes.- Almost sure convergence of renewal processes.- Generalizations of regularly varying functions.- Properties of absolutely continuous functions.- Non-degenerate groups of regular points.- Karamata's theorem for integrals.- Asymptotically quasi-inverse functions.- Generalized renewal processes.- Asymptotic behavior of solutions of stochastic differential equations.- Asymptotics for renewal processes constructed from multi-indexed random walks.- Spitzer series and regularly varying functions. - Appendix: Some Auxiliary Results.- References.- Index.