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- GCE O-Level A Maths
- Set Theory

Still Confused?

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Get Started Now- Intro Lesson11:09
- Lesson: 1a4:30
- Lesson: 1b2:00
- Lesson: 1c1:47
- Lesson: 1d1:38
- Lesson: 2a1:35
- Lesson: 2b1:41
- Lesson: 2c2:12

A set is a collection of elements (usually numbers)

E.g. {$x \in R | x$ > 0} should be read as "the set of all x's that are an element of the real numbers such that x is greater than 0."

Special symbols:

- $R$ = real numbers

- $Z$ = integers

- $N$ = natural numbers

- $Q$ = rational numbers

- $C$ = complex numbers

- $I$ = imaginary numbers

- Introduction
__Introduction to Set Builder Notation__i. What are sets?

ii. Why do we need set builder notations?

- 1.
**Translating Intervals On Number Lines Into Set Builder Notation Form**Translate the following intervals into set builder notation form.

a)b)c)d) - 2.
**Evaluating the Domains of Expressions in Set Builder Notation Form**What are the domains for the following expressions? Write the answers in set builder notation form.

a)$\frac{1}{x}$b)$\sqrt x$c)$\frac{2}{x^{2} - 4}$