:py:mod:`symfem.elements.hhj`
=============================

.. py:module:: symfem.elements.hhj

.. autoapi-nested-parse::

   Hellan-Herrmann-Johnson elements on simplices.

   This element's definition appears in https://arxiv.org/abs/1909.09687
   (Arnold, Walker, 2020)

   For an alternative construction see (Sinwel, 2009) and sections 4.4.2.2 and 4.4.3.2
   https://numa.jku.at/media/filer_public/b7/42/b74263c9-f723-4076-b1b2-c2726126bf32/phd-sinwel.pdf



Module Contents
---------------

Classes
~~~~~~~

.. autoapisummary::

   symfem.elements.hhj.HellanHerrmannJohnson




.. py:class:: HellanHerrmannJohnson(reference: symfem.references.Reference, order: int, variant: str = 'equispaced')


   Bases: :py:obj:`symfem.finite_element.CiarletElement`

   A Hellan-Herrmann-Johnson element.

   .. py:attribute:: names
      :value: ['Hellan-Herrmann-Johnson', 'HHJ']

      

   .. py:attribute:: references
      :value: ['triangle', 'tetrahedron']

      

   .. py:attribute:: min_order
      :value: 0

      

   .. py:attribute:: continuity
      :value: 'inner H(div)'

      

   .. py:attribute:: last_updated
      :value: '2023.08'

      

   .. py:method:: init_kwargs() -> Dict[str, Any]

      Return the kwargs used to create this element.

      :returns: Keyword argument dictionary