# Equation for RT element

**URL:** <https://community.freefem.org/t/equation-for-rt-element/2032>\
**Category:** General Discussion\
**Created:** [September 29, 2022, 10:46pm UTC](https://community.freefem.org/t/equation-for-rt-element/2032 "2022-09-29T22:46:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![larismartins](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/larismartins/32/2712_2.png) [@larismartins](https://community.freefem.org/u/larismartins)\
**Post date:** [September 29, 2022, 10:46pm UTC](https://community.freefem.org/t/equation-for-rt-element/2032/1 "2022-09-29T22:46:18Z")

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Hello

How do I represent this equation on FreeFem? \lambda\_H is a real number.

![Screenshot from 2022-09-29 19-44-56](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/2X/5/5260bc37c3e1a4d1f9d5f32ebc47f32dcf689756.png)