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Full Idea
It is normal to classify free logics into three sorts; positive free logics (some propositions with empty terms are true), negative free logics (they are false), and neuter free logics (they lack truth-value), though I find this unhelpful and superficial.
Gist of Idea
Same say there are positive, negative and neuter free logics
Source
Stephen Read (Thinking About Logic [1995], Ch.5)
Book Ref
Read,Stephen: 'Thinking About Logic' [OUP 1995], p.133
| 8250 | So-called 'free logic' operates without existence assumptions [Meinong, by George/Van Evra] |
| 13846 | A 'free' logic can have empty names, and a 'universally free' logic can have empty domains [Bostock] |
| 10455 | Free logic at least allows empty names, but struggles to express non-existence [Bach] |
| 9672 | Free logic is one of the few first-order non-classical logics [Priest,G] |
| 11011 | Same say there are positive, negative and neuter free logics [Read] |
| 13250 | Free logic terms aren't existential; classical is non-empty, with referring names [Beall/Restall] |
| 8694 | Free logic was developed for fictional or non-existent objects [Friend] |
| 18767 | Free logics has terms that do not designate real things, and even empty domains [Anderson,CA] |