Number sets — inclusion?
ℕ ⊂ ℤ ⊂ ⅅ ⊂ ℚ ⊂ ℝ
Interval notation — types?
Open, closed, infinite intervals
Absolute value — purpose?
Measures distance from zero
Number sets — hierarchy?
ℕ ⊂ ℤ ⊂ ⅅ ⊂ ℚ ⊂ ℝ
Interval notation — open?
Uses brackets or parentheses to specify bounds; open uses ]a;b[.
Absolute value — definition?
|x| = x if x ≥ 0; = -x if x < 0.
Set operations — union?
Combines elements from both sets.
Set operations — intersection?
Finds common elements of sets.
Equation with |x - c|?
x = c ± d; two solutions.
Interval with bounds?
Defined by lower and upper limits; open or closed.
Answer 10 questions on Fundamentals of Number Sets and Operations.
1. Which set of numbers includes all rational and irrational numbers?
2. What does the notation ]a; b[ represent in interval notation?
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