👉 In mathematics, a concentric or nested set is a collection of sets where each set has its own size and shape but shares no boundaries. The nesting is done in such a way that all elements within one set are contained within another set. For example: 1. Set A = {a, b, c} 2. Set B = {b, c, d} 3. Set C = {c, d, e} In this nested structure, the elements of set C are contained