5.1 - Number Systems

• Counting Numbers \(\N\)
  • sometimes include 0, sometimes don’t
• Integers \(\Z\) : {…,-5,-4,-3,-2,-1,0,1,2,3,4,5,…}
  • Whole number = number without fractional part
• Rational numbers: \(ℚ\)
  • can be represented as a quotient of two integers, excluding 0 for the denominator
• Irrational numbers: \(\mathbb I = \{x \mid x\in \mathbb R \land x \notin \mathbb Q\}\)
• Real: \(\R\)
• Complex: \(\mathbb C\)