FEniCS/ufl

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UFL - Unified Form Language

Stars: 151
Forks: 79
Open beginner issues: 0
Indexed issues: 42
Avg merge: 1d 16h
Merged PRs (30d): 10

Dominant language: Python
License: LGPL-3.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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42 open issues indexed

Interpolate being both a BaseForm and Expression causes issues Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

FEniCS/ufl#477 · Opened Apr 13, 2026
Documentation in manual is very outdated Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

FEniCS/ufl#472 · Opened Mar 30, 2026
Creating a FunctionSpace with a MixedElement without a MeshSequence Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

FEniCS/ufl#464 · 1 comment · Opened Feb 6, 2026
Differentiation of external operators via `ufl.diff` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

FEniCS/ufl#456 · Opened Dec 17, 2025
Add `ufl.reference_grad` Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

FEniCS/ufl#450 · 4 comments · Opened Dec 8, 2025
High-order differentiation of forms with external operators Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

FEniCS/ufl#449 · 3 comments · Opened Nov 28, 2025
Why has the class FiniteElement been removed? Open

question

Difficulty 5/5 Over a week Newbie friendliness 20/100

FEniCS/ufl#445 · 9 comments · Opened Nov 13, 2025
Make tests use fenicsx-refs.yml Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

FEniCS/ufl#432 · Opened Oct 20, 2025
Building the documentation produces many warnings and some errors Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

FEniCS/ufl#415 · Opened Sep 4, 2025
Edge case: fd.dx works but fd.par_loop fails when fd.dx subdomain_id is a single-element tuple Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

FEniCS/ufl#411 · 2 comments · Opened Aug 26, 2025
supporting built-in collections consistently in fd.dx() Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

FEniCS/ufl#407 · 1 comment · Opened Aug 18, 2025
call function treats empty-tuples and None and no-argument type differently Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

FEniCS/ufl#405 · 13 comments · Opened Aug 18, 2025
Empty form does not have arguments/arity Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

FEniCS/ufl#396 · Opened Jul 16, 2025
Adjoints of coarguments behave inconsistently Open

FEniCS/ufl#395 · 1 assignee · Opened Jul 16, 2025
Make https://pypi.org/project/UFL/ into an alias for fenics-ufl Open

housekeeping proposal

FEniCS/ufl#380 · 1 assignee · Opened May 28, 2025
Readthedocs needs a notice that it's outdated Open

housekeeping proposal

FEniCS/ufl#378 · 1 comment · 1 assignee · Opened May 19, 2025
Actions and adjoints. Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

FEniCS/ufl#301 · 10 comments · Opened Jul 23, 2024
Add information to element about traces on subentities Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

FEniCS/ufl#298 · Opened Jul 4, 2024
Add `ufl_signature` or `_ufl_signature` to all UFL objects Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#296 · 1 comment · Opened Jul 1, 2024
Remove quadrature schemes from metadata Open

FEniCS/ufl#294 · 1 assignee · Opened Jun 13, 2024
extract_domains does the wrong thing with interpolate. Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

FEniCS/ufl#282 · Opened Apr 30, 2024
Add Numpy-like functions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#280 · 1 comment · Opened Apr 29, 2024
Replace multifunctions with class methods Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#273 · 8 comments · Opened Apr 22, 2024
Form should have a quadrature rule Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

FEniCS/ufl#268 · 1 reaction · Opened Apr 18, 2024
ConstantValue and Parameter Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 32/100

FEniCS/ufl#267 · 4 comments · Opened Apr 18, 2024
Update docstrings including bullet points Open

housekeeping

Difficulty 3/5 1-2 days Newbie friendliness 35/100

FEniCS/ufl#263 · Opened Mar 26, 2024
I/O of `ufl` forms Open

enhancement proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#225 · 2 comments · Opened Oct 17, 2023
Fix warnings when building documentation Open

enhancement housekeeping

Difficulty 3/5 1-2 days Newbie friendliness 20/100

FEniCS/ufl#210 · Opened Sep 19, 2023
Improve code formatting Open

housekeeping

Difficulty 4/5 3-5 days Newbie friendliness 20/100

FEniCS/ufl#203 · Opened Sep 12, 2023
Use `typing.Self` once minimum Python version is 3.11 Open

housekeeping

Difficulty 3/5 1-2 days Newbie friendliness 42/100

FEniCS/ufl#176 · 1 comment · Opened Jun 29, 2023
Lazy Replace Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

FEniCS/ufl#171 · 1 comment · Opened Jun 8, 2023
Decide on consistent naming for Base/Abstract classes Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#170 · 2 comments · Opened Jun 8, 2023
Add tests for ufl2unicode Open

housekeeping

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

FEniCS/ufl#167 · Opened Jun 6, 2023
API inconsistency, ufl_domain vs extract_unique_domain and ufl_domains vs extract_domains Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

FEniCS/ufl#150 · Opened Feb 13, 2023
DG jump operator gives the wrong result for a vector-valued equation Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

FEniCS/ufl#138 · 3 comments · Opened Dec 22, 2022
External ufl types. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

FEniCS/ufl#127 · 3 comments · Opened Oct 16, 2022
Error in online documentation Open

FEniCS/ufl#106 · 1 comment · 1 assignee · Opened Jun 7, 2022
Use @property decorators Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 18/100

FEniCS/ufl#81 · 5 comments · 1 reaction · Opened Jan 14, 2022
Group integrals by metadata Open

proposal

Difficulty 4/5 3-5 days Newbie friendliness 35/100

FEniCS/ufl#70 · 2 comments · Opened Oct 25, 2021
`ufl.split` incompatible with `ufl.as_vector` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

FEniCS/ufl#56 · Opened May 19, 2021
DAG visitor overhaul Open

FEniCS/ufl#35 · 2 comments · 1 assignee · Opened Jul 21, 2020
CoordinateDerivative and Conj do not compose correctly. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

FEniCS/ufl#21 · 1 comment · Opened Apr 28, 2020

FEniCS/ufl

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