Critical point saddle point

鞍點（英語：Saddle point）指一個非局部極值點的駐點。鞍點這詞語來自於不定二次型 x 2 − y 2 {\displaystyle x^{2}-y^{2}\,} x^{2}-y^{2}...

In this graph, the origin is a saddle point. This is because the first partial derivatives of f(x...