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This book develops limit theorems for a natural class of long range random walks on finitely generated torsion free nilpotent groups. The limits in these limit theorems are Levy processes on some simply connected nilpotent Lie groups. Both the limit Levy process and the limit Lie group carrying this process are determined by and depend on the law of the original random walk. The book offers the first systematic study of such limit theorems involving stable-like random walks and stable limit Levy processes in the context of (non-commutative) nilpotent groups.