# Integral on interior edges only

**URL:** https://community.freefem.org/t/integral-on-interior-edges-only/3116
**Category:** General Discussion
**Created:** [April 20, 2024, 12:25pm UTC](https://community.freefem.org/t/integral-on-interior-edges-only/3116 "2024-04-20T12:25:36Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Aubium](https://avatars.discourse-cdn.com/v4/letter/a/41988e/32.png) [@Aubium](https://community.freefem.org/u/Aubium)
#### Post date: [April 20, 2024, 12:25pm UTC](https://community.freefem.org/t/integral-on-interior-edges-only/3116/1 "2024-04-20T12:25:36Z")

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Greetings fellow members,

How can I integrate on internal edges only ? If my understanding is correct, intalledges() sums over boundary and internal edges alike. Any idea how to integrate only on Omega\Fr(Omega) ?

Best regards.