# How does dolfinx distinguish between ('-') and ('+')?

**URL:** <https://fenicsproject.discourse.group/t/how-does-dolfinx-distinguish-between-and/16075>\
**Category:** General\
**Created:** [October 21, 2024, 5:27am UTC](https://fenicsproject.discourse.group/t/how-does-dolfinx-distinguish-between-and/16075 "2024-10-21T05:27:05Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [October 21, 2024, 5:35am UTC](https://fenicsproject.discourse.group/t/how-does-dolfinx-distinguish-between-and/16075/2 "2024-10-21T05:35:42Z")

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See: [Consistent side of interior boundaries with dolfinx - #2 by dokken](https://fenicsproject.discourse.group/t/consistent-side-of-interior-boundaries-with-dolfinx/15968/2)

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