User blog comment:Edwin Shade/Higher-Dimensional Spaces/@comment-1605058-20171017164149

A general remark: if you have a list of length \(\omega\), there isn't a last element of this list to be written out. For example, a list of variables of length \(\omega\) is \(a_1,a_2,\dots\), whereas the list \(a_1,a_2,\dots,a_\omega\) has length \(\omega+1\).