# Categories

[Latest](https://fenicsproject.discourse.group/latest.md) · [Categories](https://fenicsproject.discourse.group/categories.md) · [Tags](https://fenicsproject.discourse.group/tags.md)

## [Announcements](https://fenicsproject.discourse.group/c/announcements/15.md)

This category should be used for announcements, including:

## [dolfinx](https://fenicsproject.discourse.group/c/dolfinx/12.md)

This category is related to questions regarding the recommended and maintained version of DOLFIN, called DOLFINx.

## [General](https://fenicsproject.discourse.group/c/general/14.md)

Create topics here that don’t fit into any other existing category.

## [installation](https://fenicsproject.discourse.group/c/installation/5.md)

This category is for discussions about installing FEniCS on different systems:

## [mesh](https://fenicsproject.discourse.group/c/meshing/6.md)

Use this category to discuss all issues with Meshing

## [I/O](https://fenicsproject.discourse.group/c/i-o/7.md)

All discussions about Input/Output

## [mathematics](https://fenicsproject.discourse.group/c/mathematics/11.md)

The Mathematics category can be used to discuss the mathematical theory of finite element methods and partial differential equations with a view to their implementation in FEniCS. It can also be us...

## [Legacy DOLFIN](https://fenicsproject.discourse.group/c/posts-relating-to-legacy-dolfin/16.md)

This category is for posts relating to Legacy DOLFIN (formerly known as DOLFIN, no longer maintained), which is hosted on bitbucket: https://bitbucket.org/fenics-project/dolfin/.

## [variational formulation](https://fenicsproject.discourse.group/c/variational-formulation/8.md)

Discussions about how to represent equations correctly in FEniCS

## [UFL](https://fenicsproject.discourse.group/c/problem-related-to-the-unified-form-language-no-dolfinx-or-legacy-dolfin-code-in-this-category/17.md)

## [Errors](https://fenicsproject.discourse.group/c/errors/13.md)

This category should be used when an issue results in a runtime error, e.g. syntax error, function being called with wrong arguments (argument error), or a crash.

## [Linear Algebra](https://fenicsproject.discourse.group/c/linear-algebra/9.md)

All questions and discussions about solving matrix problems

## [Uncategorized](https://fenicsproject.discourse.group/c/uncategorized/1.md)

## [dolfin-adjoint](https://fenicsproject.discourse.group/c/dolfin-adjoint/10.md)

For questions related to dolfin-adjoint project http://www.dolfin-adjoint.org/

## [Site Feedback](https://fenicsproject.discourse.group/c/site-feedback/3.md)

Discussion about this site, its organization, how it works, and how we can improve it.