*Definition [#e0865da1]
The network weight nw(X) of a topological space X is the least infinite cardinal c such that X has a [[network]] of size at most c.
*Reference [#r57e0af5]
S. Geschke, ''Applications of elementary submodels in general topology'', Foundations of the Formal Sciences, May 7-9, 1999, p.13-20