We review infinite divisibility and Lévy processes in Banach spaces and discuss the relationship with notions of type and cotype. The Lévy-Itô decomposition is described. Strong, weak and Pettis-style notions of stochastic integral are introduced and applied to construct generalised Ornstein-Uhlenbeck processes
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We prove certain vector-valued continuous inclusions for Calderon-Lozanovskij spaces and, by interpolation, we obtain results on the type and cotype of these spaces. We also give an extension of Kwapień's result which states that, for [1 is less than or equal to p is less than or equal to 2], every operator from l[sub 1] into l[sub p] is (r,1)-summing, if 1/r=3/2 - 1/p.
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