not valid per se. Validity refers to entire arguments. The same is true in propositional logic (statements can be true or false but not called valid or...

Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical...

up validity or valid in Wiktionary, the free dictionary. Validity or Valid may refer to: Validity (logic), a property of a logical argument Validity (statistics)...

claims to measure. Validity is based on the strength of a collection of different types of evidence (e.g. face validity, construct validity, etc.) described...

reasoning. Deductive logic studies under what conditions an argument is valid. According to the semantic approach, an argument is valid if there is no possible...

In logic and deductive reasoning, an argument is sound if it is both valid in form and has no false premises. Soundness has a related meaning in mathematical...

concern in logic is whether a deductive inference is valid or not. Validity is often defined in terms of necessity, i.e. an inference is valid if and only...

refer to valid formulas of propositional logic. The philosopher Ludwig Wittgenstein first applied the term to redundancies of propositional logic in 1921...

has to do with the undecidability of the validity problem for FOL. The question of the status of the validity problem was posed firstly by David Hilbert...

logical validity. The logically valid formulas of a system are sometimes called the theorems of the system, especially in the context of first-order logic where...