👉 A mollifier is a mathematical function that appears in the definition of the Riemann zeta function, known as the Riemann zeta function. The zeta function is defined by the series: zeta(s) = 1 + ∑(n=1)^∞ (ζ(n) / n!) where ζ and ζ' are two complex functions that satisfy a functional equation, and ∫ is the integral operator. The term "mollifier" refers to a