👉 In mathematics and logic, "recollectible" is a concept used to describe a property that a set of numbers can be represented by an expression involving only addition, subtraction, multiplication, division, exponentiation, and negation. This means that you can express any number in the set as a sum or product of integers (or their powers), with no more than one integer involved. For example: - {1, 2} is recollectible because it can be represented by the expression