3.2 Higher Order Partial Derivatives
www.ucl.ac.uk › ~ucahmdl › LessonPlansmanner we can find nth-order partial derivatives of a function. Theorem ∂ 2f ∂x∂y and ∂ f ∂y∂x are called mixed partial derivatives. They are equal when ∂ 2f ∂x∂y and ∂ f ∂y∂x are continuous. Note. In this course all the fuunctions we will encounter will have equal mixed partial derivatives. Example. 1.