1 answer
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e.g.
A = {2n-1 | n β N} would give you all positive odd numbers.
B = { 1,2,3,4} would be the set B containing the integers 1,2,3,4
C = {x | -4 < x β€ 5 , x β R} would be the set of all real numbers between -4 and +5 excluding the -4 but including the +5
in general if you know the elements of the set, enclose them in { } brackets
the empty set or the null set is often written as Γ or {}
hope this helps,