Régularité de processus de sauts dégénérés. II. (Regularity of degenerate jump processes. II)
[For part I see ibid. 21, 125-146 (1985; Zbl 0567.60056)]. We generalize the Hörmander's theorem for jump processes and find interactions between degenerate Lévy measures or interactions in the Lévy measure itself, such the law of the processes has got a density.
scientific article; zbMATH DE number 4096524