# Inverse problems in freefem

**URL:** <https://community.freefem.org/t/inverse-problems-in-freefem/3436>\
**Category:** General Discussion\
**Created:** [August 12, 2024, 7:11am UTC](https://community.freefem.org/t/inverse-problems-in-freefem/3436 "2024-08-12T07:11:03Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![VaishnaviGnanam](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/vaishnavignanam/32/2613_2.png) [@VaishnaviGnanam](https://community.freefem.org/u/VaishnaviGnanam)\
**Post date:** [August 12, 2024, 7:11am UTC](https://community.freefem.org/t/inverse-problems-in-freefem/3436/1 "2024-08-12T07:11:03Z")

</div>

I have been trying to solve a inverse problem in freefem++. while writing the variational formulation due to that inverse problem (since the unknown is converted in terms of solution) i am getting product of two integral. It says error operator.  
How to resolve this issue? Please help. Thank you.