Calculus III - Higher Order Partial Derivatives
tutorial.math.lamar.edu › Classes › CalcIIISep 12, 2018 · Section 2-4 : Higher Order Partial Derivatives. Just as we had higher order derivatives with functions of one variable we will also have higher order derivatives of functions of more than one variable. However, this time we will have more options since we do have more than one variable. Consider the case of a function of two variables, f (x,y ...
Partial differential equation - Wikipedia
https://en.wikipedia.org/wiki/Partial_differential_equationWhen writing PDEs, it is common to denote partial derivatives using subscripts. For example: The Greek letter Δ denotes the Laplace operator; if u is a function of n variables, then A PDE is called linear if it is linear in the unknown and its derivatives. For example, for a function u of x and y, a second order linear PDE is of the form Nearest to linear PDEs are semilinear PDEs, where the highest order derivatives appear only as li…