👉 Complementarity in mathematics refers to two quantities being equal or nearly equal, with each quantity having a unique and independent value. This concept is fundamental in many areas of mathematics, such as algebra, geometry, probability theory, and more. In other words, if we have two quantities \(a\) and \(b\), where \(a\) is the first one and \(b\) is the second, complementarity means that there exists a third quantity \(c\) such that \(a = b \