👉 In mathematics, a subharmonic function is a real-valued function defined on a subset of the complex plane that is positive in a neighborhood of each point except possibly for a finite number of points (the "critical points") and negative everywhere else. This means that the function is not harmonic at any critical point but is continuous at all other points, and its value at a critical point is less than or equal to its value at infinity. For example, the function f(z) = 1
