The slope of a linear demand curve is constant. MC is the slope of the SRVC curve. A horizontal demand curve is perfectly elastic. This is shown in the saturation curve on the right. This is the osculating circle to the curve. Let formula 3 be a parametric smooth curve. A sigmoid function is a mathematical function having a characteristic "S"-shaped curve or sigmoid curve. Let formula 31 be a point on the curve. The orange line represents the constant marginal cost curve without insurance. Define points in parameter space of a curve or surface. He also throws a slider, knuckle curve and a changeup. Let be a continuous function on the directed smooth curve . A manifold is a generalization of the concepts of curve and surface. Let be a piecewise smooth Jordan plane curve. In the figure above the first curve shows a current technology.