Philosophy Lexicon of Arguments

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Canonical: canonical is a form of representation, which obeys certain rules of a science, e.g. a part of mathematics. The main focus here is to eliminate ambiguities and to enable unambiguous transformations.

Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

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I 137
Canonical models/Bigelow/Pargetter: deal with maximally consistent sets of sentences to provide completeness proofs.
Canonical models were discovered only after Hughes/Cresswell 1968, they were described in the later work (Hughes/Cresswell 1984).
Definition completeness theorem/Bigelow/Pargetter: is a theorem that proves that if a proposition in a certain semantics is guaranteed true, this proposition can be proved as a theorem. How can we prove this? How can we prove that each such proposition is a theorem?
Solution: we prove the contraposition of the theorem: Instead:
If a is assuredly true in semantics, a is a theorem
We prove
If a is not a theorem, it is not assuredly true in semantics.
Then we prove this by finding an interpretation according to which it is false.
Definition canonical model/Bigelow/Pargetter: provides an interpretation which guarantees that every non-theorem is made wrong in at least one possible world.
I 138
We begin that there will be a sentence a, for which either a or ~a is a theorem. This can be added to the axioms to give another consistent set of sentences.
Maximum consistent set of sentences/Bigelow/Pargetter: it can be proved that for the axiom systems which we deal with, there is always a maximally consistent set of sentences.
That is, a consistent set of sentences to which no further sentence can be added without making the set inconsistent.
That is, for each sentence g is either γ in the set or ~ γ.
W: be the set of all maximally consistent extensions of the axiom system with which we have begun.

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.

Big I
J. Bigelow, R. Pargetter
Science and Necessity Cambridge 1990

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Ed. Martin Schulz, access date 2017-10-18