Maths for Regular Expressions (AQA A-Level Computer Science): Flashcards

Collection of unordered values, each appears once

Positive whole numbers including zero: $\{0, 1, 2, 3, ...\}$

All whole numbers, positive and negative

Is a member of

Such that

$\{\}$ or $\emptyset$

The number of elements in the set

All elements from both sets combined

Elements common to both sets

Every element of $A$ is also in $B$