18767
|
Free logics has terms that do not designate real things, and even empty domains [Anderson,CA]
|
|
Full Idea:
Free logics say 1) singular terms are allowed that do not designate anything that exists; sometimes 2) is added: the domain of discourse is allowed to be empty. Logics with both conditions are called 'universally free logics'.
|
|
From:
C. Anthony Anderson (Identity and Existence in Logic [2014], 2.3)
|
|
A reaction:
I really like the sound of this, and aim to investigate it. Karel Lambert's writings are the starting point. Maybe the domain of logic is our concepts, rather than things in the world, in which case free logic sounds fine.
|
18771
|
Stop calling ∃ the 'existential' quantifier, read it as 'there is...', and range over all entities [Anderson,CA]
|
|
Full Idea:
Ontological quantifiers might just as well range over all the entities needed for the semantics. ...The minimal way would be to just stop calling '∃' an 'existential quantifier', and always read it as 'there is...' rather than 'there exists...'.
|
|
From:
C. Anthony Anderson (Identity and Existence in Logic [2014], 2.6)
|
|
A reaction:
There is no right answer here, but it seems to be the strategy adopted by most logicians, and the majority of modern metaphysicians. They just allow abstracta, and even fictions, to 'exist', while not being fussy what it means. Big mistake!
|
18768
|
We cannot pick out a thing and deny its existence, but we can say a concept doesn't correspond [Anderson,CA]
|
|
Full Idea:
Parmenides was correct - one cannot speak of that which is not, even to say that it is not. But one can speak of concepts and say of them that they do not correspond to anything real.
|
|
From:
C. Anthony Anderson (Identity and Existence in Logic [2014], 2.5)
|
|
A reaction:
[This summarises Alonso Church, who was developing Frege] This sounds like the right thing to say about non-existence, but then the same principle must apply to assertions of existence, which will also be about concepts and not things.
|
18765
|
Individuation was a problem for medievals, then Leibniz, then Frege, then Wittgenstein (somewhat) [Anderson,CA]
|
|
Full Idea:
The medieval philosophers and then Leibniz were keen on finding 'principles of individuation', and the idea appears again in Frege, to be taken up in some respects by Wittgenstein.
|
|
From:
C. Anthony Anderson (Identity and Existence in Logic [2014], 1.6)
|
|
A reaction:
I take a rather empirical approach to this supposed problem, and suggest we break 'individuation' down into its component parts, and then just drop the word. Discussions of principles of individuations strike me as muddled. Wiggins and Lowe today.
|
16672
|
Quantity is the quantified parts of a thing, plus location and coordination [Olivi]
|
|
Full Idea:
Quantity refers to nothing other than the parts of the thing quantified, together with their location or position, being extrinsically coordinated with each other.
|
|
From:
Peter John Olivi (Treatise on Quantity [1286], f. 49vb), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 14.1
|
|
A reaction:
I'm not sure I understand 'extrinsically'. Is there some external stretching force? God spends his time spreading out his stuff? It is nice that being spread out isn't taken for granted. We take much more for granted than they did. Motion, for example.
|
18764
|
The notion of 'property' is unclear for a logical version of the Identity of Indiscernibles [Anderson,CA]
|
|
Full Idea:
In the Identity of Indiscernibles, one speaks about properties, and the notion of a property is by no means clearly fixed and formalized in modern symbolic logic.
|
|
From:
C. Anthony Anderson (Identity and Existence in Logic [2014], 1.5)
|
|
A reaction:
The unclarity of 'property' is a bee in my philosophical bonnet, in speech, and in metaphysics, as well as in logic. It may well be the central problem in our attempts to understand the world in general terms. He cites intensional logic as promising.
|