Set Language & Notation

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Set Notation

$\in$

is an element of

$\notin$

is not an element of

$n(A)$

number of elements in set $A$

$A'$

complement of set $A$

$\varnothing$

empty set

$\xi$

universal set

$\cup$

union

$\cap$

intersection

$\subset$

is a proper subset of

$\subseteq$

is a subset of

Problems In Real-World Contexts