# How to write Neumann and mixed conditions in Freefem++?

**URL:** <https://community.freefem.org/t/how-to-write-neumann-and-mixed-conditions-in-freefem/2363>\
**Category:** General Discussion\
**Created:** [March 29, 2023, 9:25am UTC](https://community.freefem.org/t/how-to-write-neumann-and-mixed-conditions-in-freefem/2363 "2023-03-29T09:25:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ali\_Changezi](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@Ali\_Changezi](https://community.freefem.org/u/Ali_Changezi)\
**Post date:** [March 29, 2023, 9:25am UTC](https://community.freefem.org/t/how-to-write-neumann-and-mixed-conditions-in-freefem/2363/1 "2023-03-29T09:25:05Z")

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I am not sure whether this question is addressed earlier or not.  
Actually i want to know how shall i write the Neumann and Mixed boundary conditions in Freefem++?

T.I.A

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**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [March 30, 2023, 12:12pm UTC](https://community.freefem.org/t/how-to-write-neumann-and-mixed-conditions-in-freefem/2363/2 "2023-03-30T12:12:39Z")

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This depend of you problem and of the method use to get the approximation.

you can see  
[https://doc.freefem.org/documentation/finite-element.html#problem-definition](https://doc.freefem.org/documentation/finite-element.html#problem-definition)