You can use ellipsis (three points), implying there is some logical sequence (which should not be too hard to guess). For example; {1, 3, 5, 7, 9, ...} implies the set of odd numbers. Or you could write a rule, like "the set of all odd numbers", "the set of prime numbers", etc.
Some formula similar to this is often used: {x : x > 5} (the set of all x, such that x > 5).
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The set of integers is an infinite set as there are an infinite number of integers.
A null set, a finite set, a countable infinite set and an uncountably infinite set.
Infinite set is a counting number has no end.ex:{1,2,3,4....}
An infinite set whose elements can be put into a one-to-one correspondence with the set of integers is said to be countably infinite; otherwise, it is called uncountably infinite.
The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three.