MathGloss

Let URnU \subset \mathbb R^n be open. The partial derivative of a function f:URmf:U\to\mathbb R^m with respect to the iith coordinate xix_i at a=(a1,,an)Ua = (a_1,\dots,a_n) \in U is defined as fxi(a)=limh0f(a1,,ai+h,,an)f(a)h.\frac{\partial f}{\partial x_i}(a) = \lim_{h\to 0} \frac{f(a_1,\dots,a_i+h,\dots,a_n) - f(a)}{h}.

Wikidata ID: Q186475