Flashcards: Fundamentals of Number Sets and Operations — 10 cards

Number sets — inclusion?

ℕ ⊂ ℤ ⊂ ⅅ ⊂ ℚ ⊂ ℝ

Number sets — hierarchy?

ℕ ⊂ ℤ ⊂ ⅅ ⊂ ℚ ⊂ ℝ

Interval notation — types?

Open, closed, infinite intervals

Interval notation — open?

Uses brackets or parentheses to specify bounds; open uses ]a;b[.

Absolute value — purpose?

Measures distance from zero

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.