Multilinear Algebra
by Werner Greub

Persian Title: چند سال جبر

Summary and Info
This book is a revised version of the first edition and is intended as a sequel and companion volume to the fourth edition of Linear Algebra (Graduate Texts in Mathematics 23).As before, the terminology and basic results of Linear Algebra are frequently used without reference. In particular, the reader should be familiar with Chapters 15 and the first part of Chapter 6 of that book, although other sections are occasionally used.In this new version of Multilinear Algebra, Chapters 15 remain essentially unchanged from the previous edition. Chapter 6 has been completely rewritten and split into three (Chapters 6, 7, and 8). Some of the proofs have been simplified and a substantial amount of new material has been added. This applies particularly to the study of characteristic coefficients and the Pffoffian.The old Chapter 7 remains as it stood, except that it is now Chapter 9.The old Chapter 8 has been suppressed and the material which it contained (multilinear functions) has been relocated at the end of Chapters 3, 5, and 9.The last two chapters on Clifford algebras and their representations are completely new. In view of the growing importance of Clifford algebrasand the relatively few references available, it was felt that these chapters would be useful to both mathematicians and physicists.In Chapter 10 Clifford algebras are introduced via universal properties and treated in a fashion analogous to exterior algebra. After the basic isomorphism theorems for these algebras (over an arbitrary inner product space) have been established the chapter proceeds to a discussion of finitedimensional Clifford algebras. The treatment culminates in the complete classification of Clifford algebras over finitedimensional complex and real inner product spaces.The book concludes with Chapter 11 on representations of Clifford algebras. The twisted adjoint representation which leads to the definition of the spingroups is an important example. A version of Wedderburn's theorem is the key to the classification of all representations of the Clifford algebra over an 8dimensional real vector space with a negative definite inner product. The results are applied in the last section of this chapter to study orthogonal multiplications between Euclidean spaces and the existence of orthonormal frames on the sphere. In particular, it is shown that the (n 1)sphere admits an orthonormal kframe where k is the RadonHurwitz number corresponding to n. A deep theorem of F. Adams states that this result can not be improved.The problems at the end of Chapter 11 include a basisfree definition of the Cayley algebra via the complex crossproduct analogous to the definition of quaternions in Section 7.23 of the fourth edition of Linear Algebra.Finally, the Cayley multiplication is used to obtain concrete forms of some of the isomorphisms in the table at the end of Chapter 10.
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