Quine's thesis that the boundary between logical truth and empiricalfact is indeterminate implies that the 'edges between contradictory literals' encode a notion of contradiction that is framework-relative, not absolute.
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The basic building blocks of logical statements—either a single claim or its exact opposite (like 'P' or 'not P').
Quine(as a proper name referring to the philosopher whose theory is being discussed)
Willard Van Orman Quine was a 20th-century American philosopher who wrote about how we know things and how language works. In this statement, we're discussing one of his specific ideas about observation.
contradiction(Relevant to distinguishing contradictions from false contingent statements in the logic student variant of the preface paradox.)
A statement that is necessarily false in all interpretations; in this context, specifically the negation of a tautology or any falsehood drawn from a list containing only tautologies and contradictions.
logical truth(Bolzano's formal definition, inapplicable to purely logical propositions)
A proposition is logically true if all of its i^s-variants (substitutions of extra-logical ideas) are true