Math 40520 Theory of Numbers (Fall 2022)
Undergraduate number theory

 

Lecture Notes PDF


Date Lecture Topics
Wed 08/24 1 Integers in other bases
Fri 08/26 2 Digits in other bases, Fibonacci sequence
Mon 08/29 3 Prime numbers 1.2.1, unique factorization 1.1.20, Bezout
Wed 08/31 4 Bezout's formula via linear algebra
Fri 09/02 5 Linear equations
Mon 09/05 6 Gcd, lcm, unique factorization
Wed 09/07 7 Modular arithmetic 2.1 and 2.3.2, Solving diophantine equations using congruences
Fri 09/09 8 Divisibility criteria, Exponentiation 2.3.2
Mon 09/12 9 Invertible mod n 2.1.13, Chinese Remainder Theorem 2.2.2
Wed 09/14 10 Chinese Remainder Theorem 2.2.2, Explicit CRT 2.2.3
Fri 09/16 11 Euler function 2.2.1, Fermat's little theorem, Euler's theorem 2.1.2, exponentials with Euler and CRT
Mon 09/19 12 Multiplicative orders, fractions in base b, primitive roots mod p 2.5
Wed 09/21 13 Wilson's theorem and setup for the proof of the existence of primitive roots mod p
Fri 09/23 14 Counting primitive roots mod p
Mon 09/26 15 Quadratic residues, Legendre symbol
Wed 09/28 16 CRT example, solving monomial equations mod primes
Fri 09/30 17 Solving monomial equations mod primes and discrete logarithm
Mon 10/03 18 Square roots mod primes, Gauss' lemma Mod 1601 Notes
Wed 10/05 19 Gauss' lemma, quadratic reciprocity
Fri 10/07 20 Applications of quadratic reciprocity
Mon 10/10 21 Valuations, factorials
Wed 10/12 22 Valuations of factorials and of binomial coefficients
Fri 10/14 23 Valuations of binomial coefficients, counting primes
Mon 10/24 24 Lucas' Theorem on binomials mod p
Wed 10/26 25 Asymptotics of integer functions and the Prime Number Theorem
Fri 10/28 26 Asymptotics of integer functions and the Prime Number Theorem
Mon 10/31 27 Lifting the exponent, Fibonacci
Wed 11/02 28 Primitive roots mod prime powers
Fri 11/04 29 Continued fractions intro
Mon 11/07 30 Continued fractions and Mobius transformations
Wed 11/09 31 Continued fractions convergence
Fri 11/11 32 Continued fractions and rational approximations
Mon 11/14 33 Continued fractions recognizing rationals
Wed 11/16 34 Continued fractions and quadratics
Fri 11/18 35 Hensel's Lemma
Mon 11/21 36 Hensel's Lemma examples
Mon 11/28 37 Hasse-Minkowski and rational points on conics
Wed 11/30 38 The Riemann zeta function
Fri 12/02 39 Dirichlet density and the Riemann zeta function, primes in arithmetic progressions Proportion of integers that start with 1
Mon 12/05 40 Primality testing
Wed 12/07 41 Probabilistic models for primes

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