5.2.4

Sets

Test yourself

Sets of Objects

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Sets

  • Sets are collections of objects.
  • The objects in a set are called its elements.
  • A set is written using curly brackets:
    • {2,3,4} is the set containing 2,3,4
    • {positive even numbers below 5} = {2,4}
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Universal set

  • The symbol ξ is used for the universal set: the set that contains everything.
  • On a Venn diagram, ξ is everything inside the rectangle.
  • The "complement of a set A" is written as A’
    • It is the set of all the things that aren’t in A.

Jump to other topics

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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