## Basic notions of algebraThis book is wholeheartedly recommended to every student or user of mathematics. Although the author modestly describes his book as 'merely an attempt to talk about' algebra, he succeeds in writing an extremely original and highly informative essay on algebra and its place in modern mathematics and science. From the fields, commutative rings and groups studied in every university math course, through Lie groups and algebras to cohomology and category theory, the author shows how the origins of each algebraic concept can be related to attempts to model phenomena in physics or in other branches of mathematics. Comparable in style with Hermann Weyl's evergreen essay The Classical Groups, Shafarevich's new book is sure to become required reading for mathematicians, from beginners to experts. |

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### Contents

Preface | 4 |

10 Semisimple Modules and Rings | 79 |

l1 Division Algebras of Finite Rank | 90 |

Copyright | |

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### Common terms and phrases

Abelian groups algebraic groups analogue arbitrary automorphism axioms called classiﬁcation coefﬁcients cohomology commutative ring compact complex analytic complex numbers consider consists construction contained coordinate coordinatisation corresponding coset curve deﬁned deﬁnition denoted dimension direct sum division algebra elements equation exact sequence Example exists ﬁeld ﬁnd ﬁnite ﬁnite extension ﬁnite ﬁelds ﬁnite groups ﬁnite number ﬁnite rank ﬁnite type ﬁnite-dimensional ﬁrst ﬁxed follows functor g e G Galois geometry given GL(n group G Hence homomorphism identity inﬁnite integral invariant irreducible representations isomorphic kernel lattice Lie algebra Lie groups linear transformations manifold matrix module morphisms multiplication n-dimensional normal subgroup notion number ﬁeld orthogonal permutations plane properties quaternions quotient rational functions real number reﬂection relations satisﬁes semisimple sheaf simple SL(n solvable submodule subspace symmetry group tensor Theorem theory topological space unique vector ﬁelds vector space