# Derivative with respect to w

**URL:** <https://community.freefem.org/t/derivative-with-respect-to-w/2074>\
**Category:** General Discussion\
**Created:** [October 19, 2022, 1:13pm UTC](https://community.freefem.org/t/derivative-with-respect-to-w/2074 "2022-10-19T13:13:22Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![bikram](https://avatars.discourse-cdn.com/v4/letter/b/f04885/32.png) [@bikram](https://community.freefem.org/u/bikram)\
**Post date:** [October 19, 2022, 1:13pm UTC](https://community.freefem.org/t/derivative-with-respect-to-w/2074/1 "2022-10-19T13:13:22Z")

</div>

Dear all,  
If u is the function of x,y,z and w, that is, u = u(x,y,z,w). Then the partial derivatives of u with respect to x, y, and z are dx(u), dy(u), and dz(u). But how do we define the partial derivative of u with respect to w?