Concept · Foundations

Quantity and Quality

Quantity is whether a proposition is universal (about every member) or particular (about at least one member); quality is whether it is affirmative or negative.

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Why it matters

Together, quantity and quality determine whether a proposition is an A, E, I, or O form and fix its distribution pattern.

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 (1)

Categorical Propositions and the A, E, I, O FormsCategorical Logic: Terms, Classes, and Syllogistic Form

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