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

Opinion
In classical logic, intellectual assent based upon reasons, whether extrinsic or intrinsic, providing sufficient evidence to incline the intellect toward one given position over others. In such a sta...
Particular Affirmative Proposition
A categorical proposition that affirms that the predicate applies to some of the subject. Whether the predicate applies to more than some of the subject is left open. It can be formally expressed as “...
Particular Negative Proposition
A categorical proposition that denies that the predicate applies to some of the subject. Whether the predicate applies to none of the subject is left open. It can be formally expressed as “Some S is n...
Predicable
The logical relationship that a predicate bears to its subject in a proposition. There are five predicables: genus, difference, species, property, and accident. In the following proposition, the predi...
Premise
A proposition in an argument whose truth, when taken together with the truth of at least one other proposition, is supposed to entail the truth of the conclusion.
Proposition
The term in logic for the means by which the second operation of the intellect (i.e., judgment) is attained. More precisely, it is the affirmation or negation of a predicate of a subject. Sometimes a...
Rhetoric
That branch of logic which deals with arguments made on behalf of subjects of inquiry that fail to arouse definitive assent in one’s hearers. Often, this is due to the contingency of the matter in qu...
Sense / Reference
A distinction, introduced by Gottlob Frege, between the descriptive or intelligible content of a term, i.e., its sense (Sinn), and the things in reality that it is supposed to indicate, i.e., its refe...
Soundness
The quality of an argument having validity and only true premises.
Species
1. Scholastic usage (logic). A class of things contained in a genus possessing some attribute called the “specific difference” that distinguishes it from other species contained in the genus. E.g., “r...

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Topic

Lexicon

Topic

Opinion

Particular Affirmative Proposition

Particular Negative Proposition

Predicable

Premise

Proposition

Rhetoric

Sense / Reference

Soundness

Species

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