Philosophy Lexicon of Arguments

Author Item Excerpt Meta data

Books on Amazon:
Graham Priest
Field II 145
Dialethism/Priest/Paradoxa/Field: (Priest 1998): Thesis: the sentence of the liar as well as its negation are both assertable (and also their conjunction). The rules of the logic are weakened (> stronger/weaker), so that not every assertion can be asserted by this.
Most attractive variant: builds on Kleene's trivalent logic.
Trivalent logic/Kleene/Priest/Field: Priest assumes here that the valid inferences are those that guarantee "correct assertion". But an assertion is only correct if it has one of the two highest truth values in the truth value table.
Curry paradox: is thus excluded, since the only conditional in this language is the material conditional.
Material conditional/Field: the material conditional is defined by ~ and v. It does not fully support the modus ponens in the logic of Kleene/Priest.
Liar/KleeneVsPriest: (and other "deviant" sentences): have truth-value gaps. But there are no agglomerations of truth values.
Deviating Sentence: E.g. Liar sentence, has no truth-value agglomerations but truth-value gaps.
Liar/PriestVsKleene: (and other deviating sentences): have, conversely, truth-value agglomerations and no gaps.
Problem/Kleene: here one cannot establish an equivalence between "p" and "p" is true! For to assert a truth-value gap in a sentence "A" would be to assert: "~ [true ("A") v true ("~A")]" and this should be equivalent to "~ (A v ~ A)". But one sentence of this form can never be legitimate in Kleene.
Truth-value gap/logical form/Field: to assert a truth-value gap in a sentence "A" would mean to assert: "~ [true ("A") v true ("~ A")]" and this should be equivalent to "~ (A v ~ A)".
Solution/Priest: if "A" is a deviating sentence, this is then a correct assertion in Priest. Also the assertion of the absence of a truth-value agglomeration in a sentence "A" would be the assertion "~ [(true ("A") u true ("A)"]" which should be equivalent to "~(a u ~A)". Kleene cannot claim this absence for deviant sentences, Priest can do this.

Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.

Pries I
G. Priest
Beyond the Limits of Thought Oxford 2001

Fie I
H. Field
Realism, Mathematics and Modality Oxford New York 1989

Fie II
H. Field
Truth and the Absence of Fact Oxford New York 2001

H. Field
Science without numbers Princeton New Jersey 1980

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Ed. Martin Schulz, access date 2017-06-23