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**Linear algebra I. The foundations for students of mathematics and physics.
(Lineare Algebra I. Die Grundlagen für Studierende der Mathematik und Physik.)**
*(German)*
Zbl 1357.15001

Heidelberg: Springer Spektrum (ISBN 978-3-662-49913-9/pbk; 978-3-662-49914-6/ebook). xvii, 455 p. (2017).

This is the first of a two-volume text on linear algebra. The second deals mainly with multilinear algebra. Linear algebra textbooks cater for basically two types of students: those with only a rudimentary knowledge of mathematics who wish to apply matrix methods to various situations, and those with a solid mathematical foundation who wish to have a rigorous introduction to linear algebra. This book is definitely for the latter. But here, the choice is very large, so how does it differ from others? The major difference is that it takes the student on a wide tour of foundations. Thus, instead of assuming an acquaintance with \(\mathbb{R}\) and then briefly introducing \(\mathbb{C}\), the author starts with basic set theory and introduces semigroups, monoids, groups, rings, and fields, with examples. Moreover, the terms introduced are used throughout the text. There is also a section on introductory logic (e.g. quantifiers and induction). All this is of real benefit to those who wish to have a reference source for these concepts. On the other hand, it often encumbers the statements and proofs with not strictly necessary notation. Thus, this book is at the same time elementary and advanced – elementary in that the pace is gentle and everything is fully explained, advanced in that the setting is very mathematical. Chapters 1 and 2 comprise a summary of vector techniques in \(\mathbb{R}^3\). The remaining chapters are: 3. Groups, rings and fields, 4. Linear systems of equations and vector spaces, 5. Linear operators and matrices, 6. Determinants and eigenvalues, 7. Euclidean and unitary spaces, Appendix A: Basic concepts of logic, Appendix B: Sets and maps. Among the more advanced topics, there are dual spaces, minimal polynomial, Jordan canonical form, spectral theorem for normal operators, positive operators, polar decomposition, singular value decomposition, and operator norm. There are more than 200 exercises, most of them theoretical and introducing further facts.

With its 450 pages, this is a long book, packed with a great deal of information, and it will be appreciated by those who need a deeper insight. But it does not always provide a direct path to some of the key results because the way is paved with many interim results. The reader will, however, be amply rewarded by following those paths.

With its 450 pages, this is a long book, packed with a great deal of information, and it will be appreciated by those who need a deeper insight. But it does not always provide a direct path to some of the key results because the way is paved with many interim results. The reader will, however, be amply rewarded by following those paths.

Reviewer: Rabe von Randow (Bonn)

### MSC:

15-01 | Introductory exposition (textbooks, tutorial papers, etc.) pertaining to linear algebra |

00A05 | Mathematics in general |

00A06 | Mathematics for nonmathematicians (engineering, social sciences, etc.) |

00A35 | Methodology of mathematics |

15A23 | Factorization of matrices |

15A60 | Norms of matrices, numerical range, applications of functional analysis to matrix theory |

15A03 | Vector spaces, linear dependence, rank, lineability |

15A06 | Linear equations (linear algebraic aspects) |

15A15 | Determinants, permanents, traces, other special matrix functions |

15A18 | Eigenvalues, singular values, and eigenvectors |

15A21 | Canonical forms, reductions, classification |

15B48 | Positive matrices and their generalizations; cones of matrices |

15B57 | Hermitian, skew-Hermitian, and related matrices |

65F20 | Numerical solutions to overdetermined systems, pseudoinverses |