Lexicon

Topic

Moral and Political Philosophy Aesthetics Christology Ecclesiology Epistemology Human Person Logic Metaphysics Moral Theology Philosophy of Nature

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Topic

Moral and Political Philosophy Aesthetics Christology Ecclesiology Epistemology Human Person Logic Metaphysics Moral Theology Philosophy of Nature

Specific Difference
That attribute of a species that distinguishes it from other species contained in a genus. E.g., “rational” is the specific difference possessed by human beings that distinguishes them from other spec...
Subcontrariety
The logical relationship between a particular affirmative proposition and a particular negative proposition with the same terms. Subcontrary propositions cannot both be false but can both be true. The...
Superalternation / Subalternation
1. The logical relationship between a universal affirmative proposition (the superalternate) and a particular affirmative proposition (the subalternate) with the same terms, or between a universal neg...
Suppositio
In later medieval logic, a term referring to the substitutionary value that a subject of a proposition takes in relation to its predicate. The suppositio of a term determines what the term itself ref...
Syllogism
An argument containing two premises and a conclusion.
Symbolic Logic
Broadly speaking, a formal logic that employs technical symbols in the place of natural language. Here is a conditional syllogism in natural language with its symbolic counterpart in modern propositi...
Term
In logic, the product of the first operation of the intellect, i.e., the concept. The term is the subject or predicate of a proposition, especially as part of syllogistic reasoning.
Universal Affirmative Proposition
A categorical proposition that affirms that the predicate applies to the whole of the subject. It can be formally expressed as “Every S is P” with “S” standing for the subject and “P” for the predicat...
Universal Negative Proposition
A categorical proposition that denies that the predicate applies to any of the subject. It can be formally expressed as “No S is P” with “S” standing for the subject and “P” standing for the predicate...
Use / Mention
A distinction in contemporary philosophy between a word being intended to refer to something apart from itself (use) and its being intended to refer to itself (mention). The convention has been adopte...

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Topic

Lexicon

Topic

Specific Difference

Subcontrariety

Superalternation / Subalternation

Suppositio

Syllogism

Symbolic Logic

Term

Universal Affirmative Proposition

Universal Negative Proposition

Use / Mention

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