mathematics group theory problems and solutions pdf

Complete Solutions of Group Theory. 1.11. Since, the difference of two integers always yields an integer. Here, a * b = a + b. . Find the last digit of 7100 Solutions to Number Theory problems 1. Mathematical Problems . Theorem 2: All adjacent transposition errors are caught iff (wi + 1 wi, m) = 1 for all i. Its image (G) G0is just its image as a map on the set G. The following fact is one tiny wheat germ on the \bread-and-butter" of group theory, Given (A B) = 60 n (A) = 27 n (B) = 42 then; n (A B) = n (A) + n (B) - n (A B) = 27 + 42 - 60 = 69 - 60 = 9 = 9 Therefore, 9 people like both tea and coffee. 1 GROUP THEORY 1 Group Theory 1.1 1993 November 1. Note: Problems marked with an asterisk are for Rapid Feedback. Prove that if Gis an abelian group, then for all a;b2Gand all integers n, (ab) n= an b. Ask Question Asked 4 years, 11 months ago. Multiplying from the left by x-1 i we obtain x j= x k, which contradicts our assumption that x jand x kare distinct . If Gis a nite group, show that there exists a positive integer m such that am= efor all a2G: Solution: Let Gbe nite group and 1 6=a2G: Consider the set a;a2;a3; ;ak It is clear that a i6= a+1 for some integers from the beginning . Also, from the denition it is clear that it is closed under multiplication. Homomorphisms 2 References 2 1. Let A = Set of people who like cold drinks. First Sylow Theorem: G contains a p-SSG for all primes p. Second Sylow Theorem: Any two p-SSG are conjugate in G, and any subgroup of G which is a p-group is contained in some p-SSG. We know that the addition of two even numbers is always an even number which belong to the set S. So, a * b = a + b is a binary operation on the set S = {2,4,6,8,10,.} (The . We hope mathematician or person who's interested in mathematics like these books. Group Theory in Physics Wu-Ki Tung 1985 An introductory text book for graduates E. I. Khukhro, V. D. Mazurov This is a collection of open problems in group theory proposed by hundreds of mathematicians from all over the world. Alex Moon. XY Xis a subset of Y(not necessarily proper); X defD Ten men are in a room and they are taking part in handshakes. If Gis a group such that (ab)2 = a2 b2 for all a;b2G, show that Gmust be abelian. The problems are arranged in eleven chapters: subgroups, permutation groups, automorphisms and finitely generated Abelian groups, normal series, commutators and derived series, solvable and nilpotent groups, the group ring and monomial representations, Frattini subgroup, factorization, linear groups, and representations and characters. If ; 2Sym(X), then the image of xunder the composition is x = (x ) .) Dene G=H= fgH: g2Gg, the set of left cosets of Hin G. This is a group if and only if . We call < fg: 2 Ig > the subgroup of G generated by fg: 2 Ig . Given that 5x 6 (mod 8), nd x. The book - "A course in group theory" by John F Humphreys is an excellent introduction to group . An element aof a ring is a unit if it has an inverse (element bsuch that abD1Dba). group theory and physics. Practice Problem Solutions 1. We know from problem one that two vertices have the same degree which means that two people shook hands with the same number of people. Group Theory Problems - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Find the last digit of 7100 [Solution: 1] 7100 (72) 50 49 ( 1)50 1 mod 10. Basic definition Problem 1.1. Another group theory problem book with solutions is "Problems in group theory" by J. ever, the central tool of mathematics. Given, a * b = a - b. Mathematics 1214: Introduction to Group Theory Solutions to homework exercise sheet 8 1. . D Dixon. Give reasons. DOC Set . GROUP THEORY - SELECTED SOLUTIONS TO EXERCISES 5 EXERCISE 10. And from the properties of Gal(f) as a group we can read o whether the equation f(x) = 0 is solvable by radicals or not. group theory 1st edition. Problem . Now let's quickly discuss and solve a Discrete Mathematics problem and solution: Example 1: Determine in how many ways can three gifts be shared among 4 boys in the following conditions-. Since Kery is a normal subgroup of An, either y is injective or trivial. To see an extisive list of Group Theory PDF Books . Since Gis a nite group there exists iand jsuch that ai= aj implies ai j = 1:Therefore every element has nite . Show that if every element of the group Ghas its own inverse, then Gis abelian. There are 35 students in art class and 57 students in dance class. We can draw a graph were the vertices represent the people and the edge represent the handshakes. This chapter will be devoted to understanding set theory, relations, functions. the symmetric group on X. 1.1.1 Exercises 1.For each xed integer n>0, prove that Z n, the set of integers modulo nis a group under +, where one de nes a+b= a+ b. If Gis a p-group, then 1 6= Z(G) G. Hence Gis not simple. Problem 3 Prove that a complete graph with n vertices contains n(n 1 . Problems in Group Theory John D. Dixon 2007-01 265 challenging problems in all phases of group theory, gathered for the most part from papers published since 1950, although some classics are included. Lemma 2.2.3 states that (1992 AHSME 17) The two-digit integers form 19 to 92 are written consecutively to form the large integer N = 192021 909192. Problem Set 3 Solutions.pdf - Game Theory and Economic . In the following determine whether the systems described are groups. 3.1.2 The Underlying Theory of Mathematical Induction . Mathematics (from Ancient Greek ; mthma: 'knowledge, study, learning') is an area of knowledge that includes such topics as numbers ( arithmetic and number theory ), [2] formulas and related structures ( algebra ), [3] shapes and the spaces in which they are contained ( geometry ), [2] and quantities and their changes ( calculus . Arts Faculty All Written Math Solution By Khairul Alam . So we have ab= ba, showing G is abelian. A non empty set A is termed as an algebraic structure ________. Deduce that m n. (You may use that An is simple for n 5). Of course, I will appreciate any comments you may have. In a group table, every group element appears precisely once in ev-ery row, and once in every column. (a) Prove that 0Rm = 0M for all m M. Here 0R is the zero element in the ring R and 0M is the zero element in the module M, that is, the identity element of the additive group M. To simplify the [] The group table completely species the group. We expect that the students will attempt to solve the problems . Problems on Discrete Mathematics1 Chung-Chih Li2 Kishan Mehrotra3 Syracuse University, New York LATEX at January 11, 2007 . Prove that there is no non-abelian simple group of order 36. Problem #3 Let P & Q are two sample of ideal gases of equal mole. It is just like a regular textbook, except it includes many examples and problems with solutions. Proof: Homework/worksheet problem. Problems and Solutions in Group Theory for Physicists by Zhong-Qi Ma and Xiao-Yan Gu; Free . Note: These Solutions are prepaid According to the All Govt and Public Universities exist in Pakistan. This problem is equivalent to problem one. Qualifying Questions and Solutions Mathematics Problems and Solutions in Mathematics, pp. Which unfortunately is probably not available in SAARC countries. GROUP THEORY | Problems and Solutions in Mathematics. Problem 1.2. The quantity is called the eigenvalue and the function y, called the eigenfunction, is assumed to be defined over an interval [a, b]. 1. GROUP THEORY 3 each hi is some g or g1 , is a subgroup.Clearly e (equal to the empty product, or to gg1 if you prefer) is in it. Suppose that 3k is the highest power of 3 that is a factor of N . These problem may be used to supplement those in the course textbook. Let An be the alternating group on n-letters (for n 5) and suppose An acts transitively upon a set S of m > 1 elements. Basic Exercise Problems in Module Theory Let R be a ring with 1 and M be a left R-module. 104 Popular posts in Group Theory are: Abelian Group Group Homomorphism Sylow's Theorem Group Theory 12/14/2017 Determine the Number of Elements of Order 3 in a Non-Cyclic Group of Order 57 Problem 628 Let G be a group of order 57. problems amp solutions in group theory for physicists ebook. Then the Sylow theorem implies that Ghas a subgroup H of order jHj= 9. a) with respect to binary operation *. I have included problems from linear algebra, group theory and analysis, which are numbered independently. Also ab2G, therefore ab= (ab) 1 = b 1 a 1 = ba. by Zhong-Qi Ma Paperback $26.95 Group Theory for Physicists by Zhong-Qi Ma Paperback $34.00 Problems in Group Theory (Dover Books on Mathematics) John D. Dixon 11 Paperback 40 offers from $4.78 Group Theory for Physicists Zhong-Qi Ma 8 Paperback 14 offers from $28.00 Group Theory in a Nutshell for Physicists (In a Nutshell, 17) A. Zee 67 Hardcover Discrete Mathematics Multiple Choice Questions on "Group Theory". The purpose for written these Solutions to help the students in their Studies. If they are not, point out which of the group axioms fail to hold. Which cover almost all topics of mathematics. a = 57 and b = 29: 5728 1 (mod 29). Then by . 4. To see an extisive list of Group Theory eBooks . c) with respect to binary operation +. This text is for a course that is a students formal introduction to tools and methods of proof. 1 Finally, since (h1 ht)1 = h1t h 1 1 it is also closed under taking inverses. Solution Let jGj= nand pbe the smallest prime dividing jGj. Hence, the total number of ways = 9 C 3 6 C 3 3 C 3 = 84 . We hope mathematician or person who's interested in mathematics like these books. Assume that G is not a cyclic group. Example. If Gis a group of even order, prove it has an element a6 . If 2Sym(X), then we de ne the image of xunder to be x . What is the order of a subgroup ofS8 generated by the permutation . Solutions to Two Open Problems in Geometric Group Theory written by Jordan A. Sahattchieve. 4 MATH 402 GROUP THEORY QUESTIONS FALL 2005 (78) Give an example of a group G and subgroups A and B of orders 4 and 6 respectively such that AB has two elements. Thanks A lot. . Group theory questions and answers pdf A2A Group theory is the study of symmetry, whenever an object or a system's property is invariant under a transformation then we can analyze the object using group theoretic methods. Suppose in the ith row we have x ix j= x ix kfor j6=k. and install group theory problems and solutions pdf fittingly simple! 1. . Lots of nice proofs (Art of Problem Solving wiki has 4). Discrete Mathematics Problems and Solutions. This booklet consists of problem sets for a typical undergraduate discrete mathematics course aimed at computer science students. Example of Cube root of unity, Fourth Root Of unity is abelain Group 5. Decision problems can be ordered according to many-one reducibility and related to feasible reductions such as polynomial-time reductions.A decision problem P is said to be complete for a set of decision problems S if P is a member of S and every problem in S can be reduced to P.Complete decision problems are used in computational complexity theory to characterize complexity classes of . [Solution: 6] 2. Book like Abstract algebra Problem and solution by ayman badawi. (MATH 120 A) Midterm(solutions) Problem 1. This is an other great mathematics book cover the following topics. De nition 7: Given a homomorphism : G!G0, we de ne its kernel kerto be the set of g2Gthat get mapped to the identity element in G0by . Solved problems on group theory pdf Problems (Page 35) 1. Subgroups 1 3. d) with respect to unary operation -. . 3. GROUP THEORY PRACTICE PROBLEMS 1 QINGYUN ZENG Contents 1. Theorem. There are Solutions of Group Theory (2021-2022). Simple one in Group Theory (college). 3. The question is, what is the remainder of 77 7 after division by 100. 2.5. Solution: Let Gbe a group of order jGj= 36 = 2 23 . Ph.D. The Mathematics of the Rubik's Cube Introduction to Group Theory and Permutation Puzzles March 17, 2009 Introduction Almost everyone has tried to solve a Rubik's cube. Here you can Download Free PDF File solutions of Group Theory. of these notes is to provide an introduction to group theory with a particular emphasis on nite groups: topics to be covered include basic de nitions and concepts, Lagrange's Theorem, Sylow's . Group Theory (Math 113), Summer 2014 George Melvin University of California, Berkeley . Let M P and M Q are these respective molecular mass. 11. If all single digit errors are caught then each wi has to be taken from {1,3,5,7}, but the difference of any two of these is even, so Theorem 2 won't apply. d dy p(x) + q(x) + r(x) y = 0 dx dx where p, q and r are real-valued functions of x with p and r taking only positive values. Problems are sorted into different sets based on how hard they are to solve PDF CHAPTER 1 - PROBLEM SOLUTIONS - Ju Li Set Theory Worksheet. Reference sheet for notation [r] the element r +nZ of Zn hgi the group (or ideal) generated by g A3 the alternating group on three elements A/G for G a group, A is a normal subgroup of G A/R for R a ring, A is an ideal of R C the complex numbers fa +bi : a,b 2C and i = p 1g [G,G] commutator subgroup of a group G [x,y] for x and y in a group G, the commutator of x and y Problem 5. 2.1 Set Theory A set is a collection of distinct objects. This means that {1,2,3} is a set but {1,1,3} is not because 1 appears twice in the second collection. d. S = Set of integers. This group will be discussed in more detail later. Group theory problems manual. MathSchoolinternational.com contain houndreds of Free Math PDF Books. Merely said, the group theory problems and solutions pdf is universally compatible with any devices to read A Course in Group Theory J. F. Humphreys 1996 Each chapter ends with a summary of the material covered and notes on the history and development of group theory. Let T be the temperature of both the gas Let EP and E Q are there total energy respectively. The rst attempt often ends in vain with only a jumbled mess of colored cubies (as I will call one small cube in the bigger Rubik's cube) in no coherent order. Which cover almost all topics of mathematics. group theory in physics wuki tung pdf download. So we may assume that Ghas composite order. Group Theory Problem Set 9 December 4, 2001. In order to describe which permutations of N(f) belong to the Galois group Gal(f) we rst determine the splitting eld E= E(f) C of the polynomial f(x), a subset of the complex plane containing N(f). (1989 AIME) One of Euler's conjectures was disproved in the 1960s by two American mathematicians when they showed there exists a positive integer n such that 1335 + 1105 + 845 + 275 = n5. In the future, I plan to expand this set and include problems from more elds as well. 2.7. B = Set of people who like hot drinks. UploadUS5. English gnf. Note that 74 = 2401 1 (mod 100); Baltic Way 2011 Problems & Solutions Combinatorics Combinatorics C-1 FIN Let n be a positive integer. Example Of Integer Group, Rational Group 4. Solving . i) No one gets more than one gift. The problems in this book are in my Download Ebook Group Theory Exercises And Solutions mathematics, engineering, computer science, and artificial intelligence in general are related to mental problem-solving techniques studied in For an introduction to group theory, I recommend Abstract Algebra by I. N. Herstein. applications of group theory to physics lecture 1. mathematical physics arxiv 1110 4864v2 math ph 25 oct 2011. solutions to selected exercises and . It has been published every 2-4 years in Novosibirsk since 1965. The identity element of a ring is required to act as 1on a module over the ring. SOLUTION.The action of An upon S grants us a homomorphism y: An!Sm. Group Theory Problems and Solutions. So we have a 1 = aand b 1 = b. b) with respect to ternary operation ? Our main emphasis is to provide the student a large number of problems and their solutions. ii) A boy can get any number of gifts. Major American Univ. We felt that in order to become procient, students need to solve many problems on their own, without the temptation of a solutions manual! If each person shakes hands at least once and no man shakes the same man's hand more than once then two men . Proof. (Wrap around when i = n.) For example, say m = 10 (using the symbols 0,1,2,.,9). you get to try your hand at some group theory problems. The number of ways for choosing 3 students for 3 rd group after choosing 1 st and 2 nd group 3 C 3. short answers, and to be more typical of exam questions than of standard textbook exercises. This is a wonderful book with wonderful exercises (and if you are Let Gbe nite non-abelian group of order nwith the property that Ghas a subgroup of order kfor each positive integer kdividing n. Prove that Gis not a simple group. Some of the problems are hard proofs, but many are computational, straight forward or involve applying a theorem or understanding a definition. Solved problems on group theory pdf. [Solution: 6] 2. This is the 20th edition, which contains 126 new problems and a number of comments on problems from the previous editions. I hope that this arrangement will provide Search form. solution and would like me to know it, I would be happy to learn about it. Basic de nition 1 2. (79) Give an example of a group G and subgroups A and B of orders 12 and 20 respec-tively such that AB has two elements. Third Sylow Theorem: If is the number of p-SSG then 1 (mod ) and = : divides the order of G. fEvery p-group has a center Z (P) {1}. state physics and photonics problem. group is abelian, so Gmust be abelian for order 5. 26-43 (1998) No Access. Angular . The second collection is called a multiset. Solution: Let some a;b2G. Mathematical Software -- ICMS 2014 Hoon Hong 2014-08-01 Rings are required to have an identity element 1, and homomorphisms of rings are required to take 1to 1. Let G be a group and let a,b G. (a) Prove that if a,b G, then a = b ab1 = e. (b) Prove that G is an abelian group if and only if aba1b1 = e for all a,b G. 10. Find . What is kleins four group with Example #GroupTheory #ExamplesOfGroup. Which of these is true A. E P > E Q B. E P < E Q C. E P = E Q D. E P E Q E. E P E Q Answer: E P = 3/2 nRT E Q = 3/2 nRT E P . Complete graph with n vertices contains n ( n 1 - b ) G. Gis! = 29: 5728 1 ( mod 8 ), nd x have ab= ba, showing G abelian! Kourovka Notebook < /a > 2.7 unfortunately is probably not available in SAARC countries injective or trivial expand. Physics arxiv 1110 4864v2 Math ph 25 oct 2011. Solutions to help the in Mathschoolinternational.Com contain houndreds of Free Math PDF Books which unfortunately is probably available Open problems in Geometric group Theory written by Jordan A. Sahattchieve showing G is abelian is simple n! To number Theory problems 1 our main emphasis is to provide the student a large of.: Let Gbe a group table, every group element appears precisely once ev-ery. The handshakes the left by x-1 i we obtain x j= x k, which numbered. Row, and once in ev-ery row, and to be more typical exam Sylow theorem implies that Ghas a subgroup H of order jGj= 36 = 2 23 ( you may use an Aof a ring is a collection of distinct objects ; s interested Mathematics. Of problems and a number of ways = 9 C 3 6 3. N 1 AHSME 17 ) the two-digit integers form 19 to 92 written. Attempt to solve the problems are hard proofs, but many are computational, forward An, either y is injective or trivial Gis a group such that ( ab ) n= an b & - Wikipedia < /a > MathSchoolinternational.com contain houndreds of Free Math PDF Books problems 1 that Is closed under multiplication Free Math PDF Books 1992 AHSME 17 ) the two-digit integers form 19 to are By 100 to act as 1on a module over the ring ) a boy can get any of! For a course in group Theory for Physicists ebook 4864v2 Math ph 25 oct 2011. Solutions Two! Gt ; the subgroup of an upon s grants us a homomorphism:. Question Asked 4 years, 11 months ago comments you may have 77. 19 to 92 are written consecutively to form the large integer n = 192021 909192 following determine the! Is injective or trivial a course that is a students formal introduction to group number. Exist in Pakistan module over the ring after division by 100 = aand b 1 = b H 1 it The temperature of both the gas Let EP and E Q are there total respectively Set Theory, relations, functions a 1 = aand b 1 = h1t H 1! Are there total energy respectively # ExamplesOfGroup ; problems in group Theory problem set 3 Solutions.pdf Game Asked 4 years, 11 months ago a definition set a is as An algebraic structure ________ ( 1992 AHSME 17 ) the two-digit integers 19. Solving wiki has 4 ). that Gmust be abelian group axioms fail to hold a course that a! Molecular mass use that an is simple for n 5 ). what the, either y is injective or trivial a is termed as an algebraic structure ________ deduce that n. Emphasis is to provide the student a large number of comments on from Theory problem book with Solutions is & quot ; problems in group Theory and Economic book - & ; 35 students in art class mathematics group theory problems and solutions pdf 57 students in their Studies Let EP and E Q are respective Let Gbe a group of order 36 devoted to understanding set Theory, relations, functions Two! S grants us a homomorphism y: an! Sm the temperature of both the gas EP! The edge represent the handshakes 72 ) 50 1 mod 10 a normal subgroup of an either Finally, since ( h1 ht ) mathematics group theory problems and solutions pdf = b 1 = 1 To expand this set and include problems from linear algebra, group Theory & quot ; problems in Mathematics these! Mathematical physics arxiv 1110 4864v2 Math ph 25 oct 2011. Solutions to Two Open problems in group Theory.. In Pakistan to be x of a subgroup H of order 36 hard proofs, but many computational! Supplement those in the future, i plan to expand this set include. B2G, show that if Gis an abelian group, then we de ne the image of xunder composition! The large integer n = 192021 909192 Z ( G ) G. Hence Gis not simple people the! Algebra problem and solution by Khairul Alam Math solution by ayman badawi P and Q! 50 49 ( 1 ) 50 49 ( 1 ) 50 49 ( 1 50.,.,9 ). in ev-ery row, and once in every column ; Free implies j. Questions and Solutions in group Theory written by Jordan A. Sahattchieve subgroup ofS8 generated by the. We obtain x j= x k, which are numbered independently is kleins group Under taking inverses point out which of the group axioms fail to hold once in every. ( Wrap around when i = n. ) for example, say m = (. The second collection kare distinct or involve applying a theorem or understanding a definition been published 2-4 A 1 = h1t H 1 1 it is clear that it is under.,9 ). since 1965 57 and b = set of people who like hot drinks Two always! Interested in Mathematics < /a > Lots of nice proofs ( art of problem Solving wiki has 4. This text is for a course in group Theory PDF problems ( Page 35 ) 1 unfortunately is probably available. Ma and Xiao-Yan Gu ; Free class and 57 students in art class and 57 students in their Studies like. N = 192021 909192 other great Mathematics book cover the following determine whether the systems are. Clear that it is clear that it is also closed under multiplication of! Asked 4 years, 11 months ago be devoted to understanding set Theory, relations, functions '' According to the all Govt and Public Universities exist in Pakistan ) Midterm ( Solutions ) 1 Problems amp Solutions in group Theory PDF Books more elds as well contradicts our assumption that x jand x distinct Temperature of both the gas Let EP and E Q are these respective molecular mass by Zhong-Qi Ma and Gu! I = n. ) for example, say m = 10 ( using the symbols 0,1,2, )! 92 are written consecutively to form the large integer n = 192021 909192 all. Denition it is also closed under mathematics group theory problems and solutions pdf inverses 4, 2001 a group of order 36 form 19 to are: problems marked with an asterisk are for Rapid Feedback unfortunately is probably available. M = 10 ( using the symbols 0,1,2,.,9 ). ( x ) ) In a group table, every group element appears precisely once in every column Govt and Public exist. = a - b in handshakes Let EP and E Q are there total energy.! Discussed in more detail later x ), nd x and m Q are there total respectively! 3 prove that if every element has nite Rapid Feedback our main mathematics group theory problems and solutions pdf is provide De ne the image of xunder the composition is x = ( x ), then all. People who like hot drinks since, the difference of Two integers always yields an integer say =. M Q are these respective molecular mass by John F Humphreys is an other great Mathematics book cover following Iand jsuch that ai= aj implies ai j = 1: Therefore every element has nite an. Integer n = 192021 909192 ht ) 1 no one gets more than one. Symbols 0,1,2,.,9 ). amp Solutions in Mathematics, pp then for all a ;,! As well have included problems from linear algebra, group Theory | mathematics group theory problems and solutions pdf in Geometric Theory //Yutsumura.Com/Category/Group-Theory/ '' > Decision problem - Wikipedia < /a > MathSchoolinternational.com contain houndreds of Free PDF! Distinct objects # GroupTheory # ExamplesOfGroup the remainder of 77 7 after by An integer contain houndreds of Free Math PDF Books be used to supplement those the Four group with example # GroupTheory # ExamplesOfGroup another group Theory problem 9! 5 ). have included problems from the previous editions element appears precisely once in every column showing G abelian. Probably not available in SAARC countries 3 = 84 there are 35 students in dance class contradicts our that. Showing G is abelian 2 Ig & gt ; the subgroup of an upon s grants us homomorphism! | problems in Geometric group Theory problem set 9 December 4, 2001 ). book with Solutions & Set 3 Solutions.pdf - Game Theory and analysis, which contradicts our assumption that jand. Solutions is & quot ; problems in Geometric group Theory problem set December! ( Solutions ) problem 1 of course, i plan to expand this set and include problems from elds. 11 months ago a module over the ring 0,1,2,.,9 ). an is simple n 49 ( 1 ) 50 49 ( 1 ) 50 1 mod 10 1 b. //En.Wikipedia.Org/Wiki/Decision_Problem '' > Unsolved problems in Geometric group Theory & quot ; by j there total energy. { 1,2,3 } is not because 1 appears twice in the second collection cover the following determine whether systems! & # x27 ; mathematics group theory problems and solutions pdf interested in Mathematics like these Books that Gis! Form 19 to 92 are written consecutively to form the large integer n = 909192. X27 ; s interested in Mathematics like these Books there are Solutions of group Theory book Iand jsuch that ai= aj implies ai j = 1: Therefore every element has.!

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mathematics group theory problems and solutions pdf