Concept · Foundations
Validity
The property of an argument whose conclusion cannot be false while all its premises are true.
Why it matters
Validity is the central standard of deductive evaluation, and in propositional logic it can be mechanically tested.
Where this shows up
Units and lessons using this concept
Following the links will take you to the page where this term is introduced in context.
Units (3)
Foundations of Logical ReasoningStudents learn what arguments are, how to identify their parts, distinguish three fundamental modes of reasoning, evaluate argument quali…Natural Deduction: Validity and Formal ProofStudents learn to distinguish validity from truth, translate ordinary arguments into symbolic form, construct short natural-deduction pro…Propositional Logic: Form, Connectives, and Valid InferenceStudents learn to identify atomic and compound statements, master the five connectives of propositional logic, symbolize natural-language…
Lessons (9)
Building Short Formal ProofsPropositional Logic: Form, Connectives, and Valid InferenceCapstone: Building and Defending a Complete Deductive ArgumentNatural Deduction: Validity and Formal ProofCapstone: Diagnosing Real-World ReasoningFoundations of Logical ReasoningCapstone: Symbolizing, Proving, and Refuting Propositional ArgumentsPropositional Logic: Form, Connectives, and Valid InferenceEvaluating ArgumentsFoundations of Logical ReasoningSymbolizing Propositional ArgumentsNatural Deduction: Validity and Formal ProofThree Modes of ReasoningFoundations of Logical ReasoningTruth Tables, Equivalence, and ValidityPropositional Logic: Form, Connectives, and Valid InferenceValidity vs TruthNatural Deduction: Validity and Formal Proof
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