In article <firstname.lastname@example.org>, WM <email@example.com> wrote:
> > No. Suppose we have the paths 0.000 and 0.100, what is their union? And > > is it a path? > > No. But the union contains two paths. And an infinite union of that > kind may contain the path 0.111...
So according to WM a union of sets may contain an object not contained in any of the sets being unioned.
That is. indeed. an anomaly. At least in any set theory outside of Wolkenmuekenheim.