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An introduction to the geometry of numbers. Repr. of the 1971 ed. (German) Zbl 0866.11041
Classics in Mathematics. Berlin: Springer. x, 344 p. (1997).
The first edition of J. W. S. Cassels’ book appeared in 1959 (see the review in Zbl 0086.26203), and it was the first advanced textbook in the geometry of numbers since H. Minkowski’s basic work in 1896 (JFM 27.0127.09). The second edition in 1971 (Zbl 0209.34401) contained some minor changes and corrections, and now, 38 years after the first edition, the 1971 edition is reissued, which indicates the timeless quality of this book.
Of course, there has been much progress in various parts of the geometry of numbers during the last three or four decades. So the reprint does not contain the results on dense sphere packings, based on coding theory, no lattice point inequalities and nothing about lattice polytopes including Ehrhart’s polynomial and his reciprocity law. Further, recent progress in reduction theory and its application in optimization is missing.
But the book still contains the main stream of the geometry of numbers including the British school, which is characterized by the names of Mordell, Davenport, Rankin, Rogers and Swinnerton-Dyer. And there is no doubt about this book remaining a standard reference, and it still can serve as an additional advanced textbook for all types of courses in the geometry of numbers.
Reviewer: J.M.Wills (Siegen)

##### MSC:
 11Hxx Geometry of numbers 11-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to number theory 01A75 Collected or selected works; reprintings or translations of classics 52C05 Lattices and convex bodies in $$2$$ dimensions (aspects of discrete geometry) 52C07 Lattices and convex bodies in $$n$$ dimensions (aspects of discrete geometry) 52C15 Packing and covering in $$2$$ dimensions (aspects of discrete geometry) 52C17 Packing and covering in $$n$$ dimensions (aspects of discrete geometry) 11E25 Sums of squares and representations by other particular quadratic forms 11H55 Quadratic forms (reduction theory, extreme forms, etc.) 11H06 Lattices and convex bodies (number-theoretic aspects) 11H31 Lattice packing and covering (number-theoretic aspects) 11J20 Inhomogeneous linear forms 11H46 Products of linear forms 11H56 Automorphism groups of lattices 11H60 Mean value and transfer theorems 11H50 Minima of forms