Subalternation describes how a universal statement's truth guarantees the truth of its corresponding particular statement. It's a fundamental concept in…
A structural rule in logic, particularly proof theory, governs the manipulation of sequent components. It operates without regard to the…
Explore strong negation, differentiating between exclusion negation (A is not B, implying A is C) and choice negation (A is…
A strong counterexample in intuitionistic logic disproves an instance of the law of excluded middle. It's a proof of negation,…
A stipulative definition introduces a word's meaning for the first time or proposes a new meaning for an existing word,…
A statement is a declarative sentence that asserts a fact, capable of being true or false. It's the fundamental unit…
The Square of Opposition illustrates logical relations between A, E, I, and O categorical propositions. It details contradictions, contraries, subcontraries,…
Soundness ensures that a logical system's derived theorems are always true under any interpretation. It's a fundamental property for reliable…
A sound deductive argument is both valid and has true premises. This means its conclusion must be true, guaranteeing certainty.…
A sorites series presents a sequence of propositions used to illustrate the sorites paradox. It challenges our understanding of vague…