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Defeasibility
Defeasible may refer to: * Defeasibility (linguistics), the ability of an implicature or presupposition to be cancelled * Defeasible reasoning, a type of convincing but not demonstrative philosophical reasoning * Defeasible logic, a non-monotonic logic to formalize defeasible reasoning * Defeasible estate, an estate created when a grantor transfers land conditionally {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defeasible Reasoning
In philosophy of logic, defeasible reasoning is a kind of provisional reasoning that is rationally compelling, though not deductively valid. It usually occurs when a rule is given, but there may be specific exceptions to the rule, or subclasses that are subject to a different rule. Defeasibility is found in literatures that are concerned with argument and the process of argument, or heuristic reasoning. Defeasible reasoning is a particular kind of non-demonstrative reasoning, where the reasoning does not produce a full, complete, or final demonstration of a claim, i.e., where fallibility and corrigibility of a conclusion are acknowledged. In other words, defeasible reasoning produces a contingent statement or claim. Defeasible reasoning is also a kind of ampliative reasoning because its conclusions reach beyond the pure meanings of the premises. Defeasible reasoning finds its fullest expression in jurisprudence, ethics and moral philosophy, epistemology, pragmatics and con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defeasibility (linguistics)
In the linguistic field of pragmatics, an inference is said to be defeasible or cancellable if it can be made to disappear by the addition of another statement, or an appropriate context. For example, sentence would normally implicate iby scalar implicature: :i: Alice has three children. :ii: Alice has exactly three children. But the implicature can be cancelled by the modification in b :ib: Alice has three children, and possibly more. Whereas conversational implicatures and presuppositions may be cancelled, an entailment Logical consequence (also entailment or logical implication) is a fundamental concept in logic which describes the relationship between statements that hold true when one statement logically ''follows from'' one or more statements. A valid l ... may not be. For example, entails the proposition "Alice has at least three children", and this cannot be cancelled with a modification like: :ic: Alice has three children, and possibly less. Explicit and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defeasible Logic
Defeasible logic is a non-monotonic logic proposed by Donald Nute to formalize defeasible reasoning. In defeasible logic, there are three different types of propositions: ; strict rules : specify that a fact is always a consequence of another; ; defeasible rules : specify that a fact is typically a consequence of another; ; undercutting defeaters : specify exceptions to defeasible rules. A priority ordering over the defeasible rules and the defeaters can be given. During the process of deduction, the strict rules are always applied, while a defeasible rule can be applied only if no defeater of a higher priority specifies that it should not. See also * Common sense Common sense () is "knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument". As such, it is often considered to represent the basic level of sound practical judgement or know ... * Default logic References * D. Nute (1994). Defeasible logic. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |