On May 31, 12:19 am, chaja...@mail.com wrote: > > O.k., a=0.9999... is a real number. b=1 is a real number. > > > What value has b-a? > > > Karl- > > I do not know that 0.999... is a real number.
Then you are inventing a new mathematics and you can define 0.999... to be anything you like.