👉 In mathematics, a set of numbers is called summable if it can be made to be so by adding up all its members. In other words, a set S is said to be summable if there exists an increasing sequence (x1, x2, ..., xn) of elements in S such that: \[ \sum_{i=1}^{n} x_i = S \] This means that the sum of all the numbers in the set equals the whole set. For example,
