From a.rosta@ntlworld.com Sat Nov 03 19:38:46 2001
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To: "Lojban@Yahoogroups. Com" <lojban@yahoogroups.com>
Subject: "I know you have a brother..."
Date: Sun, 4 Nov 2001 03:38:02 -0000
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From: "And Rosta" <a.rosta@ntlworld.com>
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(1) and (2/2') are equivalent.

(1) I know you have a brother.
(2) I know you are not brotherless.
(2') I know it is not the case that you have no brother.

Yet only (1) can (ordinarily) be followed by (3).

(3) His name is Bill. [context: I say this to prove my
                       knowledge]

Most people want to do (1+3) as:

(4) mi djuno lo'e du'u (su'o da zo'u) da bruna do 
    i zo bil cmene da

But this is logically malformed. Instead, I would suggest:

(5) mi djuno lo'e du'u (su'o da zo'u) da bruna do 
    i zo bil cmene le co'e


I make this suggestion only to those who care a hoot about
logical well-formedness.

--And.