--- /dev/null
+.. _double_elements_page:
+
+********************************************
+Double edge, Double faces and Double volumes
+********************************************
+
+These mesh quality controls highlight the mesh elements basing on the same set of nodes.
+
+.. image:: ../images/double_faces.png
+ :align: center
+
+In this picture some faces are coincident after copying all elements with translation with subsequent Merge of nodes.
+
+**See also** a sample TUI Script of a :ref:`filter_double_elements` filters.