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).
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.
Lessons (3)
Categorical Propositions and the A, E, I, O FormsCategorical 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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