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Sets
O-Level E Math
Set Definitions
Equal sets
are sets that have exactly the same elements.
Subsets:
If every element of set $A$ is also an element of set $B$, then $A$ is a subset of $B$.
$A \subset B$ or $A \subseteq B$
Universal set $\epsilon$:
The set that contains all the elements.
Null set $\phi$ or $\{\}$:
An empty set.
Union:
$A \cup B$ → elements in $A$
or
$B$
Intersection:
$A \cap B$ → elements in $A$
and
$B$
Formulas for the Singapore O-Level Elementary Mathematics syllabus