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In differential calculus and differential geometry, an inflection point, point of inflection, flex, or inflection (British English: inflexion) is a point on a smooth plane curve at which the curvature changes sign. In particular, in the case of the graph of a function, it is a point where the function changes from being concave (concave downward) to convex (concave upward), or vice versa.

In differential calculus and differential geometry, an inflection point, point of inflection, flex, or inflection (British English: inflexion) is a point on a smooth plane curve at which the curvature changes sign. In particular, in the case of the graph of a function, it is a point where the function changes from being concave (concave downward) to convex (concave upward), or vice versa.

在微分和微分几何，一个拐点，点的拐点，弯曲，或屈折(英式英语: 拐点)是一个光滑的平面曲线上的一个点，曲率改变符号。特别是，在函数图像的情况下，它是一个点的功能变化从凹(向下)到凸(向上) ，或反之亦然。

在微分和微分几何中，拐点是光滑平面曲线上的改变曲率符号的一个点。特别地，在函数图像中，拐点处函数从凹(向下)变为凸(向上) ，反之亦然。