Rational Numbers (有理数)

  • r is rational there are integers a and b such that r=a/b and b!=0
  • Represented with the symbol (0.5, -23, 8.5)

Theorem 4.2.1

  • Every integer is a rational number

Theorem 4.3.2

  • The sum of any two rational numbers is rational

Corollary 4.2.3

  • The double of a rational number is rational
  • Derived from Theorem 4.3.2

Complex Number

  • Extended form Real Number
  • Represented with the symbol (9.1i)