【摘要】 拐点是数学的重要概念之一 ,定义应该准确 .但有的教材并非如此 ,本文指出了教材中对拐点的不充分定义 ,并证明了拐点与极值点的不重合性更多还原

【Abstract】 The yielding point is one of the important concepts, an d its definition should be precisely given. But no precise definition is given i n some textbooks. This paper points out the insufficient definition in some text books and also proves noncoincidence of the yielding point and extreme point.更多还原