Reference problem
=====================


Geometry
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We consider a parallelepiped of dimensions :math:`\mathrm{4x4x2}\mathrm{mm}` with a plane crack:


.. image:: images/100002010000049D000002F92100DED386C126DA.png
    :width: 3.9366in
    :height: 2.5366in


.. _RefImage_100002010000049D000002F92100DED386C126DA.png: