👉 In mathematics, a summation is a mathematical operation that adds up all of the terms in an expression. It can be represented by using the symbol ∑ (sigma) or sigma notation. For example: 1. ∑(x + y) = x + y + ... for any set of real numbers {x, y} 2. ∑(n^2 - 3n + 2) = n^2 - 3n + 2 for all integers n
