👉 In mathematics, a sequence is a function that assigns to each element of a set a limit value. For example, the sequence {1, 2, 3, 4, ...} defined by f(x) = x^2 for all x in the set {0, 1, 2, 3, ...} converges to the number 6. A subset S of a metric space (M, d) is said to be a subsequence if it contains the
