FEniCS/ufl

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UFL - Unified Form Language

Stars: 150
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 11, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Open All

42 open issues indexed

CoordinateDerivative and Conj do not compose correctly. Open

FEniCS/ufl#21 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
DAG visitor overhaul Open

FEniCS/ufl#35 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
`ufl.split` incompatible with `ufl.as_vector` Open

FEniCS/ufl#56 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Group integrals by metadata Open

proposal

FEniCS/ufl#70 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use @property decorators Open

enhancement

FEniCS/ufl#81 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Error in online documentation Open

FEniCS/ufl#106 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
External ufl types. Open

FEniCS/ufl#127 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
DG jump operator gives the wrong result for a vector-valued equation Open

FEniCS/ufl#138 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
API inconsistency, ufl_domain vs extract_unique_domain and ufl_domains vs extract_domains Open

FEniCS/ufl#150 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add tests for ufl2unicode Open

housekeeping

FEniCS/ufl#167 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Decide on consistent naming for Base/Abstract classes Open

proposal

FEniCS/ufl#170 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Lazy Replace Open

FEniCS/ufl#171 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use `typing.Self` once minimum Python version is 3.11 Open

housekeeping

FEniCS/ufl#176 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve code formatting Open

housekeeping

FEniCS/ufl#203 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Fix warnings when building documentation Open

enhancement housekeeping

FEniCS/ufl#210 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
I/O of `ufl` forms Open

enhancement proposal

FEniCS/ufl#225 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Update docstrings including bullet points Open

housekeeping

FEniCS/ufl#263 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ConstantValue and Parameter Open

enhancement

FEniCS/ufl#267 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Form should have a quadrature rule Open

enhancement

FEniCS/ufl#268 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Replace multifunctions with class methods Open

proposal

FEniCS/ufl#273 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add Numpy-like functions Open

FEniCS/ufl#280 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
extract_domains does the wrong thing with interpolate. Open

bug

FEniCS/ufl#282 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Remove quadrature schemes from metadata Open

FEniCS/ufl#294 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add `ufl_signature` or `_ufl_signature` to all UFL objects Open

enhancement

FEniCS/ufl#296 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add information to element about traces on subentities Open

enhancement

FEniCS/ufl#298 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Actions and adjoints. Open

FEniCS/ufl#301 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Readthedocs needs a notice that it's outdated Open

housekeeping proposal

FEniCS/ufl#378 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Make https://pypi.org/project/UFL/ into an alias for fenics-ufl Open

housekeeping proposal

FEniCS/ufl#380 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Adjoints of coarguments behave inconsistently Open

FEniCS/ufl#395 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Empty form does not have arguments/arity Open

FEniCS/ufl#396 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
call function treats empty-tuples and None and no-argument type differently Open

FEniCS/ufl#405 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
supporting built-in collections consistently in fd.dx() Open

FEniCS/ufl#407 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Edge case: fd.dx works but fd.par_loop fails when fd.dx subdomain_id is a single-element tuple Open

FEniCS/ufl#411 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Building the documentation produces many warnings and some errors Open

FEniCS/ufl#415 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make tests use fenicsx-refs.yml Open

FEniCS/ufl#432 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Why has the class FiniteElement been removed? Open

question

FEniCS/ufl#445 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
High-order differentiation of forms with external operators Open

FEniCS/ufl#449 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add `ufl.reference_grad` Open

FEniCS/ufl#450 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Differentiation of external operators via `ufl.diff` Open

FEniCS/ufl#456 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Creating a FunctionSpace with a MixedElement without a MeshSequence Open

FEniCS/ufl#464 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Documentation in manual is very outdated Open

FEniCS/ufl#472 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Interpolate being both a BaseForm and Expression causes issues Open

FEniCS/ufl#477 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

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