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This book reviews recent results on low-dimensional quantum§field theories and their connection with quantum group§theory and the theory of braided, balanced tensor§categories. It presents detailed, mathematically precise§introductions to these subjects and then continues with new§results. Among the main results are a detailed analysis of§the representation theory of U (sl ), for q a primitive§root of unity, and a semi-simple quotient thereof, a§classfication of braided tensor categories generated by an§object of q-dimension less than two, and an application of§these results to the theory of sectors in algebraic quantum§field theory. This clarifies the notion of "quantized§symmetries" in quantum fieldtheory. The reader is expected§to be familiar with basic notions and resultsin algebra.§The book is intended for research mathematicians,§mathematical physicists and graduate students.