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July 2019

Function of a real variable
natural sciences, a function of a real variable is a function whose domain is the real numbers ℝ, or a subset of ℝ that contains an interval of positive length
Function of several real variables
a function of several real variables or real multivariate function is a function with more than one argument, with all arguments being real variables
Convex function
A function f is said to be (strictly) concave if −f is (strictly) convex. Suppose f {\displaystyle f} is a function of one real variable defined
Real variable
Real variable may refer to: A variable taking real values, see Function of a real variable A free variable (archaic) Real versus nominal value (economics)
Real analysis
analytic function of a real variable extends naturally to a function of a complex variable. It is in this way that the exponential function, the logarithm
The derivative of a function of a real variable measures the sensitivity to change of the function value (output value) with respect to a change in its
Complex analysis
traditionally known as the theory of functions of a complex variable, is the branch of mathematical analysis that investigates functions of complex numbers. It is
Differentiable function
calculus (a branch of mathematics), a differentiable function of one real variable is a function whose derivative exists at each point in its domain. As a result
Characteristic function (probability theory)
characteristic function of any real-valued random variable completely defines its probability distribution. If a random variable admits a probability density
Analytic function
analytic function is a function that is locally given by a convergent power series. There exist both real analytic functions and complex analytic functions, categories