By Alexey L. Gorodentsev (auth.)

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

The direction covers mammoth parts of complex combinatorics, geometry, linear and multilinear algebra, illustration concept, type conception, commutative algebra, Galois thought, and algebraic geometry – subject matters which are frequently neglected in ordinary undergraduate courses.

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

**Read Online or Download Algebra I: Textbook for Students of Mathematics PDF**

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**Additional resources for Algebra I: Textbook for Students of Mathematics**

**Example text**

15 How many different necklaces can be made from 5 red, 7 blue, and 11 white otherwise identical glass beads? 16 All the faces of a regular (a) cube, (b) tetrahedron, are painted using six fixed colors (different faces in distinct colors) in all possible ways. How many different painted polyhedra do we get? 17 How many different knick-knacks do we get by gluing pairs of the previously painted (a) cubes, (b) tetrahedra face to face randomly? 3, is equivalent to the axiom of choice. 3 holds for every poset P and prove that every surjective map f W X Y admits a section.

A; b/ as well. a; b/ is divisible by every common divisor of a and b. a; b/. a; b/. Since 0 6 r < d, we conclude that r D 0 by the choice of d. a; b/ coincides with the set of all multiples of d. Therefore, d divides both a and b and is divisible by every common divisor of a and b. a; b/. a; b/. 4 Given an arbitrary finite collection of numbers a1 ; a2 ; : : : ; am 2 Z, use an appropriate generalization of the previous construction to produce a number d D a 1 x1 C a 2 x2 C C am xm , xi 2 Z, that divides all the ai and is divisible by all common divisors of the ai .

23 Describe the sets of all values of polynomials (a) xp x, (b) xp 1 , p 1 (c) x 2 , for x running through Fp and for x running through the set of all squares in Fp . 24 How many nonzero squares are there in Fp ? Show that the equation x2 C y2 D 1 is solvable in x; y 2 Fp for every prime p > 2. 17 See Sect. 3 on p. 28. 25 (Gauss’s Lemma) Write all elements of Fp in order as Œ. p 1/=2 ; : : : ; Œ1 ; Œ0 ; Œ1 ; : : : ; Œ. p 1/=2 : Prove that a 2 Fp is a square if and only if an even number of “positive” elements become “negative” under multiplication by a.