what does it mean if second derivative is negative
Second derivative The second derivative of a function f measures the concavity of the graph of f. A function whose second derivative is positive will be concave up (also referred to as convex), meaning that the tangent line will lie below the graph of the function. Similarly, a function whose second derivative is negative will be concave down (also simply called concave), and its tangent lines will lie above the graph of the function.
Insurance Insurance is a means of protection from financial loss. It is a form of risk management, primarily used to hedge against the risk of a contingent or uncertain loss.
Hermitian matrix The diagonal elements must be real, as they must be their own complex conjugate.
Dividend yield Its reciprocal is the Price/Dividend ratio.