# Stokes equation programming help

**URL:** <https://community.freefem.org/t/stokes-equation-programming-help/2112>\
**Category:** General Discussion\
**Created:** [November 10, 2022, 12:47pm UTC](https://community.freefem.org/t/stokes-equation-programming-help/2112 "2022-11-10T12:47:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![junjie](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@junjie](https://community.freefem.org/u/junjie)\
**Post date:** [November 10, 2022, 12:47pm UTC](https://community.freefem.org/t/stokes-equation-programming-help/2112/1 "2022-11-10T12:47:05Z")

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Hello, I’m a new student of FreeFem++.Recently, I used this software to write stokes weak finite element program, but I encountered a problem. I don’t know how to write projection operators in the program, such as the space projection from L2 space to k-order polynomial. I hope I can get your advice. Thank you very much!