# How do we implement the symmetry condition?

**URL:** <https://community.freefem.org/t/how-do-we-implement-the-symmetry-condition/2910>\
**Category:** General Discussion\
**Created:** [January 26, 2024, 3:50am UTC](https://community.freefem.org/t/how-do-we-implement-the-symmetry-condition/2910 "2024-01-26T03:50:46Z")\
**Posts on this page:** 1\
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**Author:** ![cmd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/cmd/32/67_2.png) [@cmd](https://community.freefem.org/u/cmd)\
**Post date:** [January 26, 2024, 12:41pm UTC](https://community.freefem.org/t/how-do-we-implement-the-symmetry-condition/2910/2 "2024-01-26T12:41:08Z")

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It should be enforced naturally due to the neglect of the boundary term arising  
via integration by parts.

`on(1,u2=0);`

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