一阶导函数在任一自变量 x i {\displaystyle x_{i}} 趋于0时极限为正无穷大: lim x i → 0 ∂ f ( x ) / ∂ x i = + ∞ {\displaystyle \lim _{x_{i}\to 0}\partial f(x)/\partial x_{i}=+\infty
Blunt Daniel Bradley Emmanuel Breuillard Philip Campbell Brian Cantor Ken Carslaw(英语:Ken Carslaw) Andrew P. Carter(英语:Andrew P. Carter) Patrick Chinnery Yanick