204211-src-51-1

Planed

• การนับ
  • นับเบื้องต้น เส้นตรง, วงกลม, nCr, nPr
  • inclusion-exclusion techniques
    • bijections
  • advanced counting (placing rods) $

• Proof Techniques
  • logics
  • direct proof
  • indirect proof
  • proof by contradiction

• Advanced proof techniques
  • mathematical induction
    • basic induction
    • strong induction
    • examples used: tiling, placing dominoes, induction on matrices, Fibonacci numbers
    • recursive thinking $
  • Pigeon-Hole Principle $
  • diagonalization $

• Number theory
  • divisibility
  • congruence
  • gcd, extended gcd
  • modular arithematics
  • Fermat's Little Theorem
  • polynomials $
  • secret sharing, coding $
  • RSA $

$ --- absence, to be covered

Actual

• 10 ส.ค. 51:
  • review basic induction & counting.
  • inclusion-exclusion principles.
  • using bijection in counting. (without actually define what a bijection is)
    • a bijection between subsets and bitstrings
    • a bijection between odd-sized subsets and even-sized subsets
      • gave out idea of the bijection without proof: will be in homework
    • proof of the inclusion-exclusion principle