Full Idea
In Whitehead's theory of extensive connection, no boundary elements are included in the domain of quantification. ...His conception of space contains no parts of lower dimensions, such as points or boundary elements.
Gist of Idea
With 'extensive connection', boundary elements are not included in domains
Source
report of Alfred North Whitehead (Process and Reality [1929]) by Achille Varzi - Mereology 3.1
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.8
A Reaction
[Varzi says we should see B.L.Clarke 1981 for a rigorous formulation. Second half of the Idea is Varzi p.21]