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Commit 75fb1e6e authored by oliver.sander_at_tu-dresden.de's avatar oliver.sander_at_tu-dresden.de
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Use perturbation from an affine displacement as the unknown

Previously, the unknown was the displacement.  In this setting
it is difficult to implement periodic boundary conditions,
because the displacement itself is never periodic.
We therefore change the code to use the deviation from a
given affine transformation as the new variable.
That is surprisingly simple.  It is also what the ETH group does.
parent 09e51252
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