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It is differentiable everywhere except at the point x = 0, where it makes a sharp turn as it crosses the y-axis. A cusp on the graph of a continuous function. At zero, the function is continuous but not differentiable. If f is differentiable at a point x 0, then f must also be continuous at x 0. In particular, any differentiable function must ...
This can be seen graphically as a "kink" or a "cusp" in the graph at =. Even a function with a smooth graph is not differentiable at a point where its tangent is vertical: For instance, the function given by () = / is not differentiable at =. In summary, a function that has a derivative is continuous, but there are continuous functions that do ...
Rather between any two points no matter how close, the function will not be monotone. The computation of the Hausdorff dimension of the graph of the classical Weierstrass function was an open problem until 2018, while it was generally believed that = + <.
Although it is easily visualized on the graph (which is a curve), the notion of critical point of a function must not be confused with the notion of critical point, in some direction, of a curve (see below for a detailed definition). If g(x, y) is a differentiable function of two variables, then g(x,y) = 0 is the implicit equation of a curve.
It states that if f is continuously differentiable, then around most points, the zero set of f looks like graphs of functions pasted together. The points where this is not true are determined by a condition on the derivative of f. The circle, for instance, can be pasted together from the graphs of the two functions ± √ 1 - x 2.
Its graph is the upper semicircle centered at the origin. This function is continuous on the closed interval [−r, r] and differentiable in the open interval (−r, r), but not differentiable at the endpoints −r and r. Since f (−r) = f (r), Rolle's theorem applies, and indeed, there is a point where the derivative of f is zero. The theorem ...
A function ƒ has a vertical tangent at x = a if the difference quotient used to define the derivative has infinite limit: (+) = + (+) =.The graph of ƒ has a vertical tangent at x = a if the derivative of ƒ at a is either positive or negative infinity.
However, as seen in the graph on the right (where () in blue has non-differentiable kinks similar to the absolute value function), for any in the domain of the function one can draw a line which goes through the point (, ()) and which is everywhere either touching or below the graph of f.