Remove NewtonSolver from C++ and Python interfaces - #4462
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jorgensd
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Aug 31, 2026
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Summary
Removes the deprecated
NewtonSolver/NewtonSolverNonlinearProblemclasses (C++ and Python), deprecated in v0.10.0 in favor ofdolfinx.fem.petsc.NonlinearProblemfor Python users and the very recentdolfinx::nls::SNESSolverfor C++ users. SinceNewtonSolverwas the only member of Pythondolfinx.nls, the module is removed entirely (the Python wrapper andnls/nls.petscnanobind submodules).AI assistance: I used Claude Code (Sonnet 5) to draft this PR. I reviewed, edited, tested, and take responsibility for the final contribution.