> in what sense is it symmetrical?
Just trying to get my head around this, it seems to me that what is meant is :
we provide a connectivity array, which is a square matrix describing the
connectivity relation "from cells to cells",
i.e. `connectitivy[i,j] == cell[i] adjoins cell[j]` where i and j both range
over the same cell dimension.
In which case, it **_is_** just a symmetric matrix,
meaning exactly that .. 'adjoins' is a symmetiric relation ; or `cell[i] adoins
cell[j]` <--> `cell[j] adoins cell[i]`
(thus, the array == it's own transpose, which is a definition of symmetry).
I think there are also a few technical aspects that we might want consider
pinning down a bit further...
* presumably, connectivity values are always boolean (or equivalent).
Perhaps we should state that.
* we might also state whether cells are considered to connect "to
themselves", as appearing in values of "connectivity[i,i]".
at the least, I would say we _don't_ want that aspect to be variable,
I.E. maybe we state that all "connectivity[i,i]" are always 1/true ; or
false ; or state that they have 'no meaning regardless of value'.
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