Norbert Nemec <[EMAIL PROTECTED]> writes: > You may have it more convenient in some cases with the additional set, but > the question about what is possible is unchanged for all reasonable cases.
But convenience *is* very important. Say you can prove mathematically that INTERCAL (or some extension therof) is Turing complete. I.e. that it is possible simulate a Turing machine, and therefore every known computer program or programming language, using INTERCAL. Such a proof doesn't imply that it is a good idea to scrap all other programming languages. As a concrete example, say you want to limit write access to the file /games/nethack/lib/nethackdir/record to members of the group games. And that you, at the same time, want to grant read access to everybody but guests. How would you do that? /Niels
