# Boundary condition in eigenvalue problem

**URL:** <https://community.freefem.org/t/boundary-condition-in-eigenvalue-problem/3179>\
**Category:** General Discussion\
**Created:** [April 30, 2024, 12:59pm UTC](https://community.freefem.org/t/boundary-condition-in-eigenvalue-problem/3179 "2024-04-30T12:59:32Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![maximefio](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@maximefio](https://community.freefem.org/u/maximefio)\
**Post date:** [May 6, 2024, 5:16pm UTC](https://community.freefem.org/t/boundary-condition-in-eigenvalue-problem/3179/15 "2024-05-06T17:16:38Z")

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Thank you for the answers, may I ask why different values of tgv are used for left and right hand side matrices. Also I am wondering what is the impact of setting such kind of values on the matrices themselves ?

Thank you.

My apologies, I have read this topic: [Application of Dirichlet BCs](https://community.freefem.org/t/application-of-dirichlet-bcs/467)  
and now it seems clearer to me why different values of tgv are used.

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