We consider the class of continuous functions that map an open set Ω ⊆ ℝn to ℝ with an epigraph having (locally) positive reach with an additional property. This class contains all finite convex and ...

As a tangent is a straight line it is described by an equation in the form \(y - b = m(x - a)\). You need both a point and the gradient to find its equation. You are usually given the point - it's ...