Concept · Foundations
Existential Import
The question of whether a proposition, especially a universal one, carries the claim that its subject class has at least one member.
Why it matters
Traditional and modern logic disagree about existential import, and the disagreement affects which square-of-opposition inferences are valid.
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.
Lessons (3)
Capstone: Diagnosing and Repairing Categorical ArgumentsCategorical Logic: Terms, Classes, and Syllogistic FormThe Square of Opposition and Existential ImportCategorical Logic: Terms, Classes, and Syllogistic FormVenn Diagrams for Categorical PropositionsCategorical Logic: Terms, Classes, and Syllogistic Form
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