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Existential Import · Rigorous Reasoning · Rigorous Reasoning

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.

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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.

Units (1)

Categorical Logic: Terms, Classes, and Syllogistic FormStudents learn to analyze standard-form categorical propositions, master quantity and quality, use the square of opposition, represent cl…

Lessons (3)

Capstone: Diagnosing and Repairing Categorical ArgumentsCategorical Logic: Terms, Classes, and Syllogistic Form The Square of Opposition and Existential ImportCategorical Logic: Terms, Classes, and Syllogistic Form Venn Diagrams for Categorical PropositionsCategorical Logic: Terms, Classes, and Syllogistic Form

Related

Other concepts in Foundations

A, E, I, O Propositions Accessibility Relation Argument Atomic Statement Base Rate Bayes Factor Calibration Cardinality Cartesian Product Categorical Proposition Categorical Syllogism Circularity