lojbab's summary of "ty." uses

[John Cowan <cbmvax!UUNET.UU.NET!snark.thyrsus.com!cowan>]

Everything Lojbab said about "ty." is correct, except for:

        *ty. le mu prenu

which does not mean "t of the five persons".  Unfortunately, it is
two successive sumti, "ty." and "le mu prenu".  In order to say
what "t of the five persons" says, we need:

        vei ty. [ve'o] le mu prenu

in accordance with the rule that non-numbers used as quantifiers have to
be wrapped in parentheses (vei/ve'o) to establish a mathematical context.
The right paren is elidable in this case, and probably in most cases.

Mark Shoulson also uses "li ty. .e ty." to get "T and T" where "and" is the
Boolean operator of computer science.  This is grammatical, but means the
wrong thing:

        li ty. .e fy. du li fy.

does not mean

        T(rue) and F(alse) is F(alse)

but rather is equivalent to:

        li ty. du li fy. .ije li fy. du li fy.
        T(rue) is F(alse) and F(alse) is F(alse).

which is plainly false, since True is not False.  The intended use of
operand logical connection is:

        vei ci .a vo [ve'o] prenu zvati le panka
        ( three or four ) persons are-at the park.

The best way to render the Boolean logical "and" operator is probably to use the
gismu:

        kanxe   x1 is the conjunction of x2 and x3

and make it an operator with "na'u":

        li ty. na'u kanxe li fy. du li fy.

Of course, there has to be global context assigning True to the variable
"t" and False to the variable "f".

--
cowan@snark.thyrsus.com         ...!uunet!cbmvax!snark!cowan
                e'osai ko sarji la lojban