Download PDF by Alexey L. Gorodentsev (auth.): Algebra I: Textbook for Students of Mathematics

By Alexey L. Gorodentsev (auth.)

ISBN-10: 3319452843

ISBN-13: 9783319452845

ISBN-10: 3319452851

ISBN-13: 9783319452852

This publication is the 1st quantity of a radical “Russian-style” two-year graduate path in summary algebra, and introduces readers to the fundamental algebraic buildings – fields, jewelry, modules, algebras, teams, and different types – and explains the most ideas of and techniques for operating with them.

The direction covers sizeable components of complicated combinatorics, geometry, linear and multilinear algebra, illustration conception, classification conception, commutative algebra, Galois conception, and algebraic geometry – subject matters which are usually missed in common undergraduate courses.

This textbook is predicated on classes the writer has performed on the self reliant college of Moscow and on the college of arithmetic within the larger university of Economics. the most content material is complemented by means of a wealth of routines for sophistication dialogue, a few of which come with reviews and tricks, in addition to difficulties for self sustaining study.

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Extra resources for Algebra I: Textbook for Students of Mathematics

Example text

Otherwise, we say that K has positive characteristic and define the characteristic char K to be the minimal m 2 N such that „ 1C1C 1 D 0. 1 „C 1 C ƒ‚ m C… 1/ n implies that the characteristic of an integral domain is either zero or a prime number p 2 N. 30) takes all multiples of p to zero and therefore can be factorized into the composition ~p ∘ p of ring homomorphisms p WZ Fp ; z 7! Œzp and ~p W Fp ,! K ; Œzp 7! 2 on p. 34, because Fp is a field. Thus, the smallest subring with unit in an integral domain K of positive characteristic p is a field isomorphic to Fp D Z=.

13) 1 Logical “exclusive OR ” (XOR ): a C b is true if and only if precisely one of a, b is true (and not both). Logical AND : a b is true if and only if both a and b are true. 2 Logical NOT x evaluates to true if and only if x is false. Nonexclusive x OR y is true if and only if at least one of x and y is true. 5 on p. 9. 10) are satisfied. 10) requires some intellectual effort, which is generally undertaken in the first chapters of a course in real analysis. I hope that you have taken such a course.

Fx . ax / 2 Kx , with not all the ax equal to zero, either equals zero or divides zero in K , then the family is a zero divisor in x Q Kx . 0; 0; : : : ; 0/ : Thus, the direct product of more than one ring cannot be a field. 13 Show that for two given prime numbers p; q 2 N, the product Fp Fq consists of the zero element, . 0; b/, where a ¤ 0 and b ¤ 0. Note that Fp Fq ' Fp Fq . ax / such Q that each ax is invertible in Kx . 1 Homomorphisms of Abelian Groups A map of abelian groups ' W A ! 27) holds in the group B.

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Algebra I: Textbook for Students of Mathematics by Alexey L. Gorodentsev (auth.)

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