Temporal integration (class TemporalIntegrator)
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.. autoclass:: TemporalIntegrator.TemporalIntegrator
    :members:
.. autoclass:: TemporalIntegrator.BackwardEuler
    :members:
.. autoclass:: TemporalIntegrator.CrankNicolson
    :members:
.. autoclass:: TemporalIntegrator.MidpointDriftIntegrator
    :members: