RAS Social ScienceGosudarstvo i pravo

  • ISSN (Print) 1026-9452
  • ISSN (Online)2713-0398

Devising the set of abnormalities for a given defeasible rule

PII
S2074-14720000616-8-
DOI
Publication type
Article
Status
Published
Authors
Volume/ Edition
Volume 26 / Issue 1
Pages
9-35
Abstract
Devising adaptive logics usually starts with a set of abnormalities and a deductive logic. Where the adaptive logic is ampliative, the deductive logic is the lower limit logic, the rules of which are unconditionally valid. Where the adaptive logic is corrective, the deductive logic is the upper limit logic, the rules of which are valid in case the premises do not require any abnormalities to be true. In some cases, the idea for devising an adaptive logic does not relate to a set of abnormalities, but to one or more defeasible rules, and perhaps also to one of the deductive logics. Defeasible rules are not universally valid, but are valid in ‘normal situations’ or for unproblematic parts of premise set. Where the idea is such, the set of abnormalities has to be delineated in view of the rules. The way in which this task may be tackled is by no means obvious and is the main topic studied in the present paper. The outcome is an extremely simple and transparent recipe. It is shown that, except for very special cases, the recipe leads to an adequate result.
Keywords
adaptive logics, defeasible reasoning, defeasible rules, conditional derivation, dynamic proofs, abnormalities, falsehood, content guidance
Date of publication
01.06.2020
Number of purchasers
22
Views
560

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At the Ministry of Education and Science of the Russian Federation

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