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## Details

Document Type: | Book |
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All Authors / Contributors: |
Andy R Magid |

ISBN: | 9781482208054 1482208059 |

OCLC Number: | 878953539 |

Description: | xv, 168 pages ; 24 cm. |

Contents: | Separability Separable fields Separable rings Separable schemes Separable polynomials Module projective algebras Idempotents and Profinite Spaces Boolean algebras and idempotents Profinite spaces Covering spaces Profinite group actions Rings of functions The Boolean Spectrum Pierce's representation Topology of the Boolean spectrum The sheaf on the Boolean spectrum Boolean spectra and rings of functions Galois Theory over a Connected Base Separable, strongly separable, locally strongly separable Separably closed and separable closure Separability idempotents Infinite and locally weakly Galois extensions Galois correspondence Separable Closure and the Fundamental Groupoid Componential strong separability Separable closure Correspondence for separably closed Categorical correspondence Categorical Galois Theory and the Galois Correspondence Subobjects, equivalence relations, and quotients Splitting extensions and categorical correspondences Index Bibliographic notes appear at the end of each chapter. |

Series Title: | Monographs and textbooks in pure and applied mathematics. |

Responsibility: | Andy R. Magid. |

More information: |

### Abstract:

"The first edition of this book appeared with a copyright date of 1974; arithmeti- cally inclined readers will note that this is exactly 40 years prior to the copyright date of this edition. It was my hope, with the earlier edition, to give an account of a subject which I termed \more or less complete". Of course no mathematics is ever complete. The subject itself moved on, most notably, in the work of George Janelidze on Galois theory in categories, a de nitive account of which may found in the book Galois Theories by Janelidze and Francis Borceux. An explanation of that theory will not be attempted here. Rather, I have the much more modest aim of revisiting that earlier work with whatever insights an additional four decades of doing mathematics can bring to bear. That means that virtually every result and every piece of exposition has been rewritten and recast, often to include additional generality, although, at least to the author, the logical arc of the earlier volume remains mostly intact. One exception to the previous assertion is that this volume include a self contained exposition of the theory of separable algebras. The excellent lecture notes Separable Algebras over Commutative Rings by DeMeyer and Ingraham which was used as a citation source for that theory in the rst edition remains in print. However, the likelihood that mathematicians today have seen that ma- terial, either in the cited work or another source, is small, warranting including an exposition in this volume, and given that, the temptation to explain my own understanding of separability was too great to resist. This book is, at heart, commutative algebra, the author, at heart, being a commutative algebraist"--

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"This book provides a complete and self-contained account of the Galois theory of commutative rings ..." -Nikolay I. Kryuchkov, Zentralblatt MATH 1298

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