Concept · Foundations

A, E, I, O Propositions

The four standard forms of categorical proposition: A (universal affirmative), E (universal negative), I (particular affirmative), and O (particular negative).

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Why it matters

Every standard-form categorical claim is one of these four, and each form has a characteristic distribution pattern used in syllogistic analysis.

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)

Categorical Propositions and the A, E, I, O FormsCategorical 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

Other concepts in Foundations

Accessibility Relation Argument Atomic Statement Base Rate Bayes Factor Calibration Cardinality Cartesian Product Categorical Proposition Categorical Syllogism Circularity Compound Statement