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#When 'referring' to singleton categories, it is useful to signal this, because singleton categories are largely impervious to logical scope, and keeping track of issues of logical scope is mentally burdensome. Signalling the singletonhood spares users unnecessary mental effort.
#Reasons for '''lo pa broda''' and '''le pa broda''' not being satisfactory solutions include: (a) arguably, '''lo pa''' makes an unwanted additional truthconditional <u>claim</u> about singletonhood; (b) it is perverse to be obliged to make the effort of using extra words when the object is to save mental effort. '''tu'o broda''' implicates '''lo pa broda'''.
#It is uncongenial to be forced to make redundant lexical choices that make no difference to the meaning. For singleton categories the choice among '''tu'o'''/'''ro'''/'''lo'''/'''le ''' is redundant, and rather than having to arbitrarily choose one of them, it would be nice to have a word that neutralizes the choice.#* Addendum: For singleton categories the choice among '''tu'o'''/'''ro'''/'''lo'''/'''le'''/'''loi'''/'''lei ''' is redundant.
*I don't see a valid reason to bother using '''tu'o ''' over '''lo pa ''' here. Also, I generally see '''tu'o''' used with '''du'u'''. Is there a semantic difference between that and '''le du'u'''? It seems as exactly the singleton category, making gadri redundant. What does '''lo 2 du'u''' mean? --[[User:xod|la xod]]
*The reason is given under points (6) & (7) above. You may not think them valid, but those who do think them valid can use '''tu'o'''. --[[User:And Rosta|And Rosta]]
*I don't find them valid. For every number except 1 we're supposed to use '''lo ny.''', and with 1 we don't announce the number but resort to a completely different digit which only implies 1, and hide the gadri? That is inelegant. I don't understand what truthconditional claim is made by lo pa which isn't by '''tu'o''', or why it would be a problem. Complaints about lexical redundancy would lead one to stick with the standard formula instead of taking advantage of '''tu'o''', which was not invented for this purpose at all. --[[User:xod|la xod]]
*For any number, including 1, '''lo PA''' will make a truthconditional claim about the cardinality of lo'i broda. As explained in the summary, sometimes we don't want to make a truthconditional claim that there is only one broda, but if there happens to be only one then it is desirable to have a very simple way to indicate it (for reasons explained in the summary). The complaints about lexical redundancy are complaints about unneutralizable contrasts: Lojban makes such categories as tense and number optional, but it makes categories of specificity and distributivity obligatory, even when they are vacuous.
* What other sort of claim is possible in Lojban besides a truthconditional claim? An attitudinal claim? --[[User:xod|la xod]]
* So-called 'presuppositions', which are propositions that are not part of what the speaker is asserting to be true. By default, Lojban does not use presupposition, but it uses it in at least the following cases. (1) Some UI. (2) Within e-gadri descriptions. (3) Within '''voi ''' clauses. --[[User:And Rosta|And Rosta]]* What is wrong with making a truthconditional claim concerning the quantification? That if the number turns out to be other than '''pa''', the entire claim is disqualified? --[[User:xod|la xod]]
* There are various things wrong, such as our wish to be helpful to our interlocutor while at the same time claiming no more than we wish to. But a concrete example is that '''na ku lo pa broda cu brode''' does not entail '''no da cu brode''', which is what one would ordinarily wish it to entail. --[[User:And Rosta|And Rosta]]
There is also another use of '''tu'o''' which is not inconsistent with the above use to quantify singleton categories. Namely, '''tu'o ''' deletes the quantification of the description in question, leaving only the meaning of of the description to fill the sumti slot. In other words, '''broda tu'o brode''' basically claims that '''brode''', but without actually picking out some actual brode to put in that slot. For example:
# '''mi kalte tu'o pavyseljirna xirma'''
#* ''I'm unicorn-hunting.'' #*'''lo''' in this case would imply that some unicorn actually exists, which is false.# '''mi nitcu tu'o tanxe'''#* ''I need a box/I box-need.'' #*(Without claiming that there exists an actual box which I need.)
This use of '''tu'o''' is equivalent (at least in meaning) to '''[[lo'ei]]'''. --[[Adam|Adam]]
;: Okay, then in the later usage, the quantification is deleted, and so the meaning of the sumti must be determined without quantifying over the underlying set. It doesn't claim that the underlying set is a singleton; in fact it avoids making any claim whatsoever about the cardinality of the underlying set, so it is consistent with the desire to not have to make claims about the cardinality of inherently singleton sets at all. So it is inconsistent with the above statement "'''tu'o broda''' implicates '''lo pa broda'''", but it is not inconsistent with the motivation for using it in the first usage. --[[Adam|Adam]]
'''--> [[null quantification{{See also|null quantification]]'''}}
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