# Typos on demo website

**URL:** <https://fenicsproject.discourse.group/t/typos-on-demo-website/5140>\
**Category:** Uncategorized\
**Created:** [February 23, 2021, 3:16am UTC](https://fenicsproject.discourse.group/t/typos-on-demo-website/5140 "2021-02-23T03:16:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Miraboreasu](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@Miraboreasu](https://fenicsproject.discourse.group/u/Miraboreasu)\
**Post date:** [February 23, 2021, 3:16am UTC](https://fenicsproject.discourse.group/t/typos-on-demo-website/5140/1 "2021-02-23T03:16:33Z")

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[https://fenicsproject.org/olddocs/dolfin/latest/python/demos/nonlinear-poisson/demo\_nonlinear-poisson.py.html](https://fenicsproject.org/olddocs/dolfin/latest/python/demos/nonlinear-poisson/demo_nonlinear-poisson.py.html)

 ![image](https://global.discourse-cdn.com/free1/uploads/fenicsproject1/original/2X/d/d10fb09134540f250d736fbf29991ea661d19eb0.png)

It will be great if someone can fill with the nonlinear Poisson PDE.

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [February 23, 2021, 8:50am UTC](https://fenicsproject.discourse.group/t/typos-on-demo-website/5140/2 "2021-02-23T08:50:05Z")

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Fix pushed in: [Bitbucket](https://bitbucket.org/fenics-project/dolfin/pull-requests/535)  
Should be:  
- \nabla\cdot((1 + u^2) \nabla u) = f \quad {\rm in}\, \Omega,  
 u = 1 \quad {\rm on}\, \Gamma\_D,  
 \nabla u\cdot n = 0 \quad {\rm on}\, \Gamma\_N.