# Intalledges command and reduced order model

**URL:** <https://community.freefem.org/t/intalledges-command-and-reduced-order-model/701>\
**Category:** General Discussion\
**Created:** [December 22, 2020, 11:52pm UTC](https://community.freefem.org/t/intalledges-command-and-reduced-order-model/701 "2020-12-22T23:52:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mordechaiy](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mordechaiy](https://community.freefem.org/u/mordechaiy)\
**Post date:** [December 22, 2020, 11:52pm UTC](https://community.freefem.org/t/intalledges-command-and-reduced-order-model/701/1 "2020-12-22T23:52:32Z")

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Dear FF++ users,

I would to ask please two separately questions ,

1. In which case (or cases) should one use the “intalledges” command rather than the “int1d” command?

2. Are there any libraries in FF++ that are dedicated to reduced order model techniques for dynamic problems? if yes, could you please name some of them?

Thanks in advance,

Mordechai.