[lojban-beginners] Re: questions about questions

[Sunnan <sunnan@handgranat.org>]

On Thu, 2005-12-01 at 08:33 -0700, jkominek@miranda.org wrote:
> On Thu, Dec 01, 2005 at 03:19:17PM +0100, HeliodoR wrote:
> > > No, they don't. There are rather a lot of important cmavo which are sumti.
> > >
> > > mi, do, ko'a, ko'i, ma, & da all come to mind immediately.
> > 
> > Uhh... Yeah. But those are pro-sumti.  So the moral is that EVERY
> > (sumti AND NOT pro-sumti) INVOLVE selbri.  Okay now?
> 
> No. pro-sumti are a subset of sumti. Not some unrelated set. Thus, not
> all sumti involve selbri.
> 
While I'm confused about darves position that sumti involve selbri
(where did that come from?) I'd like to point out that you can AND NOT
with full subsets. I.e. if all fish are wet, you can still talk about
things that are wet AND NOT fish. (Most non-logicians would use "but
not" in those cases, though.)