# Need help about the nonlinear PDE

**URL:** <https://community.freefem.org/t/need-help-about-the-nonlinear-pde/814>\
**Category:** Feature Request\
**Created:** [February 16, 2021, 7:02pm UTC](https://community.freefem.org/t/need-help-about-the-nonlinear-pde/814 "2021-02-16T19:02:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Salman123](https://avatars.discourse-cdn.com/v4/letter/s/b9e5f3/32.png) [@Salman123](https://community.freefem.org/u/Salman123)\
**Post date:** [February 16, 2021, 7:02pm UTC](https://community.freefem.org/t/need-help-about-the-nonlinear-pde/814/1 "2021-02-16T19:02:17Z")

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I am trying to solve the nonlinear problem w.r.t freeFEM++. My problem contain the term uv\partial w/\partial x. Where u, v, w are dependent variables. Any one guide me, how I write in the code this term? Please need help.