Subalternation in Logic
Subalternation describes how a universal statement's truth guarantees the truth of its…
Structural Rule in Logic
A structural rule in logic, particularly proof theory, governs the manipulation of…
Strong Negation: Exclusion vs. Choice Negation
Explore strong negation, differentiating between exclusion negation (A is not B, implying…
Strong Counterexample in Intuitionistic Logic
A strong counterexample in intuitionistic logic disproves an instance of the law…
Stipulative Definitions: Defining New Meanings
A stipulative definition introduces a word's meaning for the first time or…
Statement: The Building Block of Logical Discourse
A statement is a declarative sentence that asserts a fact, capable of…
Square of Opposition
The Square of Opposition illustrates logical relations between A, E, I, and…
Soundness in Logic
Soundness ensures that a logical system's derived theorems are always true under…
Sound Deductive Argument
A sound deductive argument is both valid and has true premises. This…
Sorites Series: Navigating Vagueness and Paradox
A sorites series presents a sequence of propositions used to illustrate the…