On Feb 7, 8:06 pm, WM <mueck...@rz.fh-augsburg.de> wrote: > On 7 Feb., 19:46, William Hughes <wpihug...@gmail.com> wrote: > > > Gosh, you are really running away > > from the fact that induction can > > show d is not in the list. > > Induction can show that *your* d does not exist.
My d? You are the one who defined d to be the antidiagonal of the list. You also show by induction that the antidiagonal of a list is not in the list.