# Issues Solving Pure Neumann Problems in dolfinx

**URL:** <https://fenicsproject.discourse.group/t/issues-solving-pure-neumann-problems-in-dolfinx/10468>\
**Category:** dolfinx\
**Created:** [February 17, 2023, 9:32pm UTC](https://fenicsproject.discourse.group/t/issues-solving-pure-neumann-problems-in-dolfinx/10468 "2023-02-17T21:32:50Z")\
**Posts on this page:** 1\
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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:** [February 17, 2023, 11:09pm UTC](https://fenicsproject.discourse.group/t/issues-solving-pure-neumann-problems-in-dolfinx/10468/2 "2023-02-17T23:09:01Z")

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You can remove the constant nullspace with PETSc. See for instance

> <https://github.com/ComputationalPhysiology/oasisx/blob/main/src/oasisx/fracstep.py#L269>

> <https://github.com/ComputationalPhysiology/oasisx/blob/main/src/oasisx/fracstep.py#L449>

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