Five examples of Infinite set

1) The set of all natural numbers: {1, 2, 3, 4, 5, ...}

2) The set of all integers: {..., -2, -1, 0, 1, 2, ...}
3) The set of all rational numbers: {1/2, 2/3, 3/4, 4/5, ...}
4) The set of all real numbers: {1, √2, π, e, ...}
5) The set of all possible permutations of a given set.