Hi all,

The documentation of collect_periodic_faces() 
<https://www.dealii.org/current/doxygen/deal.II/namespaceGridTools.html#ab22eef800535f9e85a1723a6a36fd0f6>
 reads

Instead of defining a 'first' and 'second' boundary with the help of two 
boundary_ids this function defines a 'left' boundary as all faces with 
local face index 2*dimension and boundary indicator b_id and, similarly, a 
'right' boundary consisting of all face with local face 
index 2*dimension+1 and boundary indicator b_id. Faces with coordinates 
only differing in the direction component are identified.

I am confused as to what could 'dimension' mean here. Neither the template, 
nor the arguments have any variable called dimension. For dimension=3, this 
would mean faces with local ids 6 and 7 would be looked for. They don't 
exist right??

I was wondering if this is a typo and 'dimension' should actually be 
'direction'. Any clarification would be greatly helpful.

Thanking in anticipation
Vachan

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