On 23 Mrz., 19:08, "Mike Terry" <news.dead.person.sto...@darjeeling.plus.com> wrote: > "David R Tribble" <da...@tribble.com> wrote in messagenews:firstname.lastname@example.org... > > > WM wrote: > > >>... consider the list of finite initial segments of natural numbers > > > 1 > > > 1, 2 > > > 1, 2, 3 > > > ... > > > > According to set theory it contains all aleph_0 natural numbers in its > > > lines. But is does not contain a line containing all natural numbers. > > > Therefore it must be claimed that more than one line is required to > > > contain all natural numbers. This means at least two line are > > > necessary. > > > That is correct. In fact, all Aleph_0 lines are required > > (necessary sufficient) to contain all of the naturals. > > This is sufficient but not necessary. (Aleph_0 lines are necessary and > sufficient.) > This is a false claim, if induction is valid and if |N has more elements than every finite line. For aleph_0 lines, namely every finite line, my proof shows that they are not necessary.