This book concerns the theory of unipotent elements in simple algebraic groups over algebraically closed or finite fields, and nilpotent elements in the corresponding simple Lie algebras. These topics have been an important area of study for decades, with applications to representation theory, character theory, the subgroup structure of algebraic groups and finite groups, and the classification of the finite simple groups. The main focus is on obtaining full information on class representatives and centralizers of unipotent and nilpotent elements. Although there is a substantial literature on this topic, this book is the first single source where such information is presented completely in all characteristics. In addition, many of the results are new--for example, those concerning centralizers of nilpotent elements in small characteristics. Indeed, the whole approach, while using some ideas from the literature, is novel, and yields many new general and specific facts concerning the structure and embeddings of centralizers.
Ross Lawther, Donna M. Testerman ... collection of T-weights on V is the union (with multiplicities) of the sets {d – 1, d – 3, . . . , 3– d, 1 – d}, where the union runs over the Jordan blocks of e on V and d is the size of the block ...
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After the fundamental work of Borel and Chevalley in the 1950s and 1960s, further results were obtained over the next thirty years on conjugacy classes and centralizers of elements of such groups.
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121, there is a unique 4-dimensional non-nilpotent Lie algebra having a one-dimensional centre and a ... no subgroup of dimension two or three, (b) the group L(G) is the three-dimensional unipotent group of nilpotency class two.