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Single Idea 8079

[filed under theme 5. Theory of Logic / G. Quantification / 3. Objectual Quantification ]

Full Idea

Aristotelian logic has two quantifiers of the subject ('all' and 'some'), and two ways to combine the subject with the predicate ('have', and 'have not'), giving four propositions: all-s-have-p, all-s-have-not-p, some-s-have-p, and some-s-have-not-p.

Gist of Idea

Aristotelian logic has two quantifiers of the subject ('all' and 'some')

Source

report of Aristotle (Prior Analytics [c.328 BCE]) by Keith Devlin - Goodbye Descartes Ch.2

Book Ref

Devlin,Keith: 'Goodbye Descartes: the end of logic' [Wiley 1997], p.39


A Reaction

Frege seems to have switched from 'some' to 'at-least-one'. Since then other quantifiers have been proposed. See, for example, Ideas 7806 and 6068.

Related Ideas

Idea 7806 Boolos invented plural quantification [Boolos, by Benardete,JA]

Idea 6068 We need an Intentional Quantifier ("some of the things we talk about.."), so existence goes into the proposition [McGinn]


The 9 ideas with the same theme [universal and existential quantifiers picking objects]:

Aristotelian logic has two quantifiers of the subject ('all' and 'some') [Aristotle, by Devlin]
Frege reduced most quantifiers to 'everything' combined with 'not' [Frege, by McCullogh]
Frege introduced quantifiers for generality [Frege, by Weiner]
Existence is entirely expressed by the existential quantifier [Russell, by McGinn]
'Partial quantifier' would be a better name than 'existential quantifier', as no existence would be implied [McGinn]
'All horses' either picks out the horses, or the things which are horses [Jubien]
Philosophers reduce complex English kind-quantifiers to the simplistic first-order quantifier [Jubien]
The universal quantifier can't really mean 'all', because there is no universal set [Hart,WD]
It is better if the existential quantifier refers to 'something', rather than a 'thing' which needs individuation [Lowe]