Elementary Number Theory (110.304)

Spring 2014


[Course Syllabus]


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Lecture Schedule and Assignment

(This is tentative schedule. Check here for frequent updates.)
 

Date Topic Sections Homework Due Date
Week 1 Feb 6
Jan 28 Introduction.
Principle of mathematical induction
1.1 Page 6: 4, 9, 12, 13, 16, 18
Page 14: 2, 3, 5, 7
Jan 30 Euclid's division lemma 2.1
Week 2 Feb 13
Feb 4 Divisibility. Linear Diophantine equation 2.2 Page 21: 1(d), 2, 4, 10, 12
Page 25: 1(d)
Page 28: 6(b)(c), 9(b), 10
Feb 6 More on linear Diophantine equation
Fundamental theorem of arithmetic
2.3, 2.4
Week 3 Feb 20
Feb 11 Permutations and combinations
Fermat's little theorem
3.1, 3.2 Page 33: 3, 5, 10, 13, 14
Page 38: 1, 3, 6
Page 40: 1, 2
Feb 13 Wilson's theorem, etc 3.3, 3.5
Week 4 Feb 27
Feb 18 Generating functions
Basic properties of Congruences
3.4, 4.1

Page 43: 2, 5
Page 51: 1, 2, 3, 6
Page 55: 2(a), 4
Page 61: 1, 3

Feb 20 Residue Systems
Solving Linear Congruences.
4.2, 5.1
Week 5 Mar 6
Feb 25 Fermat and Wilson Theorem (using congruences). Chinese remainder theorem 5.2, 5.3 Page 63: 3, 4, 6, 9, 11, 12, 16(c)
Page 70: 1(c), 2, 6
Feb 27 Polynomial congruences. 5.3, 5.4
Week 6 Mar 13
Mar 4 Midterm I   Page 73: 1, 6, 7, 8
Page 81: 1, 4, 11, 15
Mar 6 Combinatorial study of φ(n) 6.1
Week 7 Mar 27
Mar 11 Formulae for d(n) and σ(n)
Multiplicative arithmetic functions
6.2, 6.3 Page 84: 2, 3, 4, 5, 6
Page 90: 2, 5, 7, 8, 11
Mar 13 Möbius inversion formula 6.4
Week 8  
Mar 18 No Class (spring break)    
Mar 20  
Week 9 Apr 3
Mar 25 Properties of reduced residue systems 7.1 Page 96: 6, 7
Page 99: 2, 3, 7, 8, 9, 10, 11, 12
Mar 27 Primitive roots modulo p 7.2
Week 10 Apr 10
Apr 1 Elementary properties of π(x) 8.1 Page 104: 1, 2, 4, 6, 15, 16, 17, 18
Page 110: 2, 3
Apr 3 Tchebychev's theorem 8.2
Week 11 Apr 17
Apr 8 Euler's criterion. Legendre Symbol 9.1, 9.2 Page 116: 1(c)
Page 118: 2, 3
Page 124: 2, 3, 5
Page 127: 1, 2, 4, 5
Apr 10 Quadratic reciprocity law 9.3, 9.4
Week 12 Apr 29
Apr 15 Applications of quadratic reciprocity law
Review
9.4, 10.1 Page 132: 1, 2, 3, 4, 5
Apr 17 Midterm II  
Week 13  
Apr 22 Consecutive residues and non-residues 10.1 No Homework
Apr 24 Consecutive triples of quadratic residues
Sum of two squares
10.2, 11.1
Week 14  
Apr 29 Sum of four squares 11.2 No Homework
May 1 Review