On 9 Dez., 20:42, Zuhair <zaljo...@gmail.com> wrote: > On Dec 9, 9:33 pm, WM <mueck...@rz.fh-augsburg.de> wrote:> On 9 Dez., 18:50, Zuhair <zaljo...@gmail.com> wrote: > > > > On Dec 9, 7:34 pm, fom <fomJ...@nyms.net> wrote: > > > > > "Is x a member of y?" is a purely yes or no question. > > > > > Only with respect to a well-construed universe of discourse. > > > > WRONG, a "consistent" theory in classical logic is just enough. > > > With respect to real numbers we need not only the answer to the > > question whether x is a real number, but we need trichotomy with > > respect to every real number. Undefinable numbers cannot satisfy this > > need. > > Of course they can, why not?
How would you decide whether an undefinable number is positive or negative?