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Download e-book for iPad: Algebra, Volume 1: Fields and Galois Theory (Universitext) by Falko Lorenz

By Falko Lorenz

ISBN-10: 0387316086

ISBN-13: 9780387316086

The current textbook is a full of life, problem-oriented and punctiliously written advent to classical smooth algebra. the writer leads the reader via attention-grabbing subject material, whereas assuming in basic terms the historical past supplied via a primary path in linear algebra.

The first quantity specializes in box extensions. Galois thought and its functions are taken care of extra completely than in such a lot texts. It additionally covers simple functions to quantity conception, ring extensions and algebraic geometry.

The major concentration of the second one quantity is on extra constitution of fields and comparable subject matters. a lot fabric no longer often coated in textbooks looks right here, together with actual fields and quadratic varieties, diophantine dimensions of a box, the calculus of Witt vectors, the Schur staff of a box, and native category box theory.

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

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

Example text

Since ᐆ is finite but K is infinite, there exist distinct 1 ; 2 2 K such that K. 1 ˛ C ˇ/ D K. 2 ˛ C ˇ/ DW L: Then . 1 ˛ C ˇ/ . 2 ˛ C ˇ/ D . 1 2 /˛ lies in L, and therefore so does ˛, and likewise ˇ. It follows that E D L D K. 1 ˛ C ˇ/, so that E=K is simple (with D 1 ˛ C ˇ as a primitive element). ˛; ˛n /. For K a finite field the assertion follows from the fundamental theorem of the theory of finite fields, which we will study later (Theorem 2 in Chapter 9). ˜ 4 Fundamentals of Divisibility Throughout this chapter, R stands for a commutative ring with unity.

Iii) Every nonconstant polynomial in C ŒX  is completely decomposable into linear factors. (iv) If E=C is an algebraic field extension, E D C . Proof. (i) ) (ii): Let f 2 C ŒX  be irreducible. ˛/ D 0. X ˛/, necessarily with 2 C . (ii) ) (iii): By (ii), only linear polynomials can appear in the prime factorization of f 2 C ŒX . (iii) ) (iv): Let E=C be algebraic. ˛/ of any ˛ 2 E is irreducible, hence linear, by (iii). Therefore ˛ 2 C . The algebraic closure of a field 57 (iv) ) (i): Suppose f 2 C ŒX  is nonconstant.

Is Kf a field? We will show that this is so if and only if f is irreducible. Recall that a polynomial f 2 KŒX  is irreducible if deg f 1 and any factorization f D f1 f2 with f1 ; f2 2 KŒX  implies that f1 2 K or f2 2 K. An irreducible polynomial is also called a prime polynomial. The following result is fundamental and well-known: Theorem 2. Let f be an irreducible polynomial in KŒX . If f divides gh for g; h 2 KŒX , then f j g or f j h. Proof. This assertion, which you’re surely familiar with, will follow from general considerations in Chapter 4.

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

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