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Download Algebra, Volume 1: Fields and Galois Theory (Universitext) by Falko Lorenz PDF

By Falko Lorenz

The current textbook is a full of life, problem-oriented and thoroughly written creation to classical glossy algebra. the writer leads the reader via fascinating material, whereas assuming merely the history supplied via a primary path in linear algebra.

The first quantity specializes in box extensions. Galois concept and its purposes are handled extra completely than in such a lot texts. It additionally covers simple purposes to quantity thought, ring extensions and algebraic geometry.

The major concentration of the second one quantity is on extra constitution of fields and comparable issues. a lot fabric now not often coated in textbooks seems right here, together with genuine fields and quadratic types, diophantine dimensions of a box, the calculus of Witt vectors, the Schur staff of a box, and native classification box theory.

Both volumes comprise a variety of workouts and will be used as a textbook for complex undergraduate scholars.

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Additional info for Algebra, Volume 1: Fields and Galois Theory (Universitext)

Sample text

Taking the image in RŒX  gives f D gh. Since an is nonzero, we must have deg g D deg g 1 and deg h D deg h 1. Since R is an integral domain, we get a contradiction with the assumption that f is irreducible. ˜ In applying F9, one is usually dealing with a unique factorization domain R, because apart from the fact that otherwise one has hardly any control over the primitivity of f , it is also not permissible in the general case to deduce that f is irreducible over K D Frac R. On the other hand, the train of thought that leads to F9 can be useful even if we don’t know ahead of time that f is irreducible, but rather we know something about the possible factorizations of f in RŒX .

Denote by ᐆ be the set of all intermediate fields of E=K. ˛/. To prove the finiteness of ᐆ, consider the set ˇ ˚ « Ᏸ D g 2 EŒX  ˇ g is normalized and divides f in EŒX  : Now, it is well known that EŒX  enjoys unique factorization into prime factors (see for example LA II, p. 142, or the next chapter in this book). Therefore f has only finitely many normalized factors in EŒX , and thus Ᏸ is finite. ˇ0 ; : : : ; ˇm 1 /. ˛/ is a factor of f in LŒX , therefore also in EŒX . Thus g lies in Ᏸ. By F11, L is the image of g under the map (33).

In view of the uniqueness statement in F7, we talk from now on about the fraction field of R; we denote it by Frac R. For simplicity we will generally assume that R Â Frac R, which entails no loss of generality. We then have Frac R D fa=b j a; b 2 R; b ¤ 0g: The reason we were so punctilious in the statement of F7 is that this is a key example of solving a universal problem of the kind that one often comes across in algebra (and elsewhere). Construction of fraction fields 29 Before proving F7, we state one more result: F8.

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